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bold="true" encoding="ISO8859-1" family="Times New Roman" italic="false" underline="false">\311quations diff\351rentielles ordinaires
               (d'ordre 1 et de degr\351 1)</Font></Text-field><Text-field layout="Author" style="ParagraphStyle1"><Font encoding="ISO8859-1" family="Times New Roman" style="_cstyle260"> \251 Pierre Lantagne </Font><Font family="Times New Roman" style="_cstyle262">(juin 2001)</Font></Text-field><Text-field layout="_pstyle257" style="_cstyle258"><Font encoding="ISO8859-1" family="Times New Roman">Coll\350ge de Maisonneuve</Font></Text-field><Text-field layout="_pstyle258" style="_cstyle259"><Font family="Times New Roman">plantag@edu.cmaisonneuve.qc.ca</Font></Text-field><Text-field layout="_pstyle259" style="Hyperlink"><Hyperlink family="Times New Roman" hyperlink="true" linktarget="http://math.cmaisonneuve.qc.ca/plantagne" style="Hyperlink">http://math.cmaisonneuve.qc.ca/plantagne</Hyperlink></Text-field><Text-field layout="Normal" style="Normal"/><Group><Input><Text-field layout="Normal" prompt="&gt; " style="Maple Input">restart;</Text-field></Input></Group><Section collapsed="true"><Title><Text-field layout="Heading 1" style="Heading 1"><Font family="Times New Roman"> Macro-commande <Font bold="true" size="18" style="_cstyle264">dsolve</Font></Font></Text-field></Title><Section collapsed="true"><Title><Text-field layout="Heading 2" style="Heading 2"><Font encoding="ISO8859-1" family="Times New Roman"> Solution g\351n\351rale</Font></Text-field></Title><Text-field layout="Normal" style="Normal"><Font encoding="ISO8859-1" family="Times New Roman">Une \351quation diff\351rentielle est une \351quation qui comporte des d\351riv\351es. L'\351quation est dite \351quation diff\351rentielle ordinaire (EDO) s'il n'y a qu'une seule variable ind\351pendante et que les d\351riv\351es sont exprim\351es par rapport \340 cette variable. L'ordre d'une EDO est celui de la d\351riv\351e de l'ordre le plus \351lev\351 apparaissant dans l'\351quation et le degr\351 d'une EDO est le degr\351 de la d\351riv\351e de l'ordre le plus \351lev\351. </Font></Text-field><Text-field layout="Normal" style="Normal"/><Text-field layout="Normal" style="Normal"><Font encoding="ISO8859-1" family="Times New Roman">Dans cette feuille Maple, on ne traitera que des \351quations diff\351rentielles ordinaires d'ordre 1 et de degr\351 1 dont la forme normale est</Font></Text-field><Text-field layout="_pstyle260" style="_cstyle335"><Equation input-equation="d*y/(d*x) = f(x,y);" style="_cstyle335">NiMvKiglImRHIiIiJSJ5R0YmKiZGJUYmJSJ4R0YmISIiLSUiZkc2JEYpRic=</Equation></Text-field><Text-field layout="Normal" style="Normal"/><Text-field layout="Normal" style="Normal"><Font encoding="ISO8859-1" family="Times New Roman">Dans les manuels de math\351matiques, la forme diff\351rentielle d'une \351quation diff\351rentielle ordinaire d'ordre 1 de degr\351 1</Font></Text-field><Text-field layout="_pstyle261" style="_cstyle336"><Equation input-equation="M(x,y)*dx+N(x,y)*dy=0" style="_cstyle336">NiMvLCYqJi0lIk1HNiQlInhHJSJ5RyIiIiUjZHhHRitGKyomLSUiTkdGKEYrJSNkeUdGK0YrIiIh</Equation></Text-field><Text-field layout="Normal" style="Normal"><Font encoding="ISO8859-1" family="Times New Roman">est utile pour classifier de telles \351quations.</Font></Text-field><Text-field layout="Normal" style="Normal"/><Text-field layout="Normal" style="Normal"><Font family="Times New Roman">La macro-commande </Font><Hyperlink family="Times New Roman" hyperlink="true" linktarget="Help:dsolve" style="Hyperlink">dsolve</Hyperlink><Font encoding="ISO8859-1" family="Times New Roman"> de la biblioth\350que de base sera employ\351e pour trouver de mani\350re analytique la solution g\351n\351rale. (Rappelons que, malgr\351 son nom, la solution g\351n\351rale peut ne pas contenir toutes les solutions particuli\350res d'une \351quation diff\351rentielle.)</Font></Text-field><Text-field layout="Normal" style="Normal"/><Text-field layout="Normal" style="Normal"><Font encoding="ISO8859-1" family="Times New Roman">Soit l'\351quation diff\351rentielle suivante \340 r\351soudre.</Font></Text-field><Text-field layout="_pstyle262" style="_pstyle262"><Font family="Times New Roman"> </Font><Equation input-equation="x*dx-y*dy=0" style="_cstyle357">NiMvLCYqJiUieEciIiIlI2R4R0YnRicqJiUieUdGJyUjZHlHRichIiIiIiE=</Equation></Text-field><Text-field layout="Normal" style="Normal"><Font encoding="ISO8859-1" family="Times New Roman">Pour bien se faire comprendre par l'\351valuateur, il faudra lui communiquer l'\351quation dans une \351criture formul\351e en termes de d\351riv\351es plut\364t qu'en termes de diff\351rentielles. Reformul\351e, l'\351quation diff\351rentielle \340 r\351soudre est donc  </Font><Equation input-equation="x-y*dy/dx = 0;" style="2D Comment">NiMvLCYlInhHIiIiKiglInlHRiYlI2R5R0YmJSNkeEchIiJGKyIiIQ==</Equation><Font encoding="ISO8859-1" family="Times New Roman">. De plus, il sera n\351cessaire d'utiliser</Font><Font family="Times New Roman" style="_cstyle337"> la syntaxe fonctionnelle </Font><Font encoding="ISO8859-1" family="Times New Roman">pour communiquer \340 l'\351valuateur laquelle des deux variables est d\351sign\351e variable d\351pendante.</Font></Text-field><Text-field layout="Normal" style="Normal"/><Text-field layout="Normal" style="Normal"><Font encoding="ISO8859-1" family="Times New Roman">La formule d\351riv\351e peut \352tre \351nonc\351e soit avec l'op\351rateur de d\351rivation </Font><Font style="_cstyle308">D</Font><Font family="Times New Roman">, soit avec la macro-commande </Font><Font style="_cstyle309">diff</Font><Font family="Times New Roman">.</Font></Text-field><Text-field layout="Normal" style="Normal"/><Text-field layout="Normal" style="Normal"><Font encoding="ISO8859-1" family="Times New Roman">Nommons EDO l'\351quation diff\351rentielle </Font><Equation input-equation="x-y*dy/dx = 0;" style="2D Comment">NiMvLCYlInhHIiIiKiglInlHRiYlI2R5R0YmJSNkeEchIiJGKyIiIQ==</Equation><Font family="Times New Roman">.</Font></Text-field><Text-field layout="Normal" style="Normal"><Font family="Times New Roman">Utiliser la macro-commande </Font><Font style="_cstyle310">diff</Font><Font encoding="ISO8859-1" family="Times New Roman"> requiert 14 caract\350res \340 taper.</Font></Text-field><Group><Input><Text-field layout="Normal" prompt="&gt; " style="Maple Input">EDO:=x-y(x)*diff(y(x),x)=0;</Text-field></Input></Group><Text-field layout="Normal" style="Normal"><Font encoding="ISO8859-1" family="Times New Roman">Tandis que l'op\351rateur </Font><Font style="_cstyle311">D</Font><Font family="Times New Roman"> en requiert 9.</Font></Text-field><Group><Input><Text-field layout="Normal" prompt="&gt; " style="Maple Input">EDO:=x-y(x)*D(y)(x)=0;</Text-field></Input></Group><Group><Input><Text-field layout="Normal" prompt="&gt; " style="Maple Input"/></Input></Group><Text-field layout="Normal" style="Normal"><Font family="Times New Roman">La macro-commande </Font><Hyperlink family="Times New Roman" hyperlink="true" linktarget="Help:odeadvisor" style="Hyperlink">odeadvisor</Hyperlink><Font family="Times New Roman"> de l'extension </Font><Hyperlink family="Times New Roman" hyperlink="true" linktarget="Help:DEtools" style="Hyperlink">DEtools</Hyperlink><Font encoding="ISO8859-1" family="Times New Roman"> donne pour r\351sultat le</Font><Font family="Times New Roman" style="_cstyle270"> </Font><Font encoding="ISO8859-1" family="Times New Roman">type d'\351quation diff\351rentielle<Font style="_cstyle338"> reconnue par l'\351valuateur</Font></Font><Font family="Times New Roman">.</Font></Text-field><Group><Input><Text-field layout="Normal" prompt="&gt; " style="Maple Input">with(DEtools, odeadvisor);</Text-field></Input></Group><Text-field layout="Heading 3" style="Heading 3"/><Group><Input><Text-field layout="Normal" prompt="&gt; " style="Maple Input">odeadvisor(EDO);</Text-field></Input></Group><Text-field layout="Normal" style="Normal"><Font encoding="ISO8859-1" family="Times New Roman">\300 l'aide de la macro-commande </Font><Font style="_cstyle358">dsolve</Font><Font encoding="ISO8859-1" family="Times New Roman">, r\351solvons cette \351quation diff\351rentielle \340 variables s\351parables.</Font></Text-field><Group><Input><Text-field layout="Normal" prompt="&gt; " style="Maple Input">Sol:=dsolve(EDO,y(x));</Text-field></Input></Group><Group><Input><Text-field layout="Normal" prompt="&gt; " style="Maple Input"/></Input></Group><Text-field layout="Normal" style="Normal"><Font encoding="ISO8859-1" family="Times New Roman">Par d\351faut et sous certaines conditions, l'\351valuateur s'efforcera de formuler la solution g\351n\351rale de mani\350re explicite. Par contre, il est possible d'imposer ponctuellement \340 l'afficheur la formulation implicite de la solution g\351n\351rale qui a \351t\351 trouv\351e en pr\351cisant, en option, l'attribut </Font><Font style="_cstyle263">implicit</Font><Font family="Times New Roman">. </Font></Text-field><Group><Input><Text-field layout="Normal" prompt="&gt; " style="Maple Input">Sol:=dsolve(EDO,y(x),implicit);</Text-field></Input></Group><Group><Input><Text-field layout="Normal" prompt="&gt; " style="Maple Input"/></Input></Group><Text-field layout="Normal" style="Normal"><Font encoding="ISO8859-1" family="Times New Roman">Pour une formulation plus habituelle de la r\351ponse, reformulons </Font><Font style="_cstyle317">Sol</Font><Font family="Times New Roman"> en termes de <Font style="_cstyle318">y</Font> et de C.</Font></Text-field><Group><Input><Text-field layout="Normal" prompt="&gt; " style="Maple Input">Sol_generale:=subs([y(x)=y,_C1=C],Sol);</Text-field></Input></Group><Text-field layout="Normal" style="Normal"/><Text-field layout="Normal" style="Normal"><Font encoding="ISO8859-1" family="Times New Roman">Durant les "efforts" de r\351solution d\351ploy\351s par l'\351valuateur, on peut \352tre tenu au courant des diff\351rentes tentatives de </Font><Font style="_cstyle278">dsolve</Font><Font encoding="ISO8859-1" family="Times New Roman"> dans la recherche d'une m\351thode pouvant \352tre appliqu\351e pour la r\351solution analytique de l'\351quation en cours. Il suffit d'initialiser la variable </Font><Font style="_cstyle359">infolevel</Font><Font family="Times New Roman"> comme suit:</Font></Text-field><Group><Input><Text-field layout="Normal" prompt="&gt; " style="Maple Input">infolevel[dsolve]:=3;</Text-field></Input></Group><Text-field layout="Normal" style="Normal"><Font encoding="ISO8859-1" family="Times New Roman">R\351solvons de nouveau l'\351quation EDO pour voir.</Font></Text-field><Group><Input><Text-field layout="Normal" prompt="&gt; " style="Maple Input">Sol:=dsolve(EDO,implicit);</Text-field></Input></Group><Group><Input><Text-field layout="Normal" prompt="&gt; " style="Maple Input"/></Input></Group><Text-field layout="Normal" style="Normal"><Font encoding="ISO8859-1" family="Times New Roman">Pour r\351tablir la "discr\351tion" de l'\351valuateur, il faut taper:</Font></Text-field><Group><Input><Text-field layout="Normal" prompt="&gt; " style="Maple Input">infolevel[dsolve]:=0;</Text-field></Input></Group><Group><Input><Text-field layout="Normal" prompt="&gt; " style="Maple Input"/></Input></Group><Text-field layout="Normal" style="Normal"><Font encoding="ISO8859-1" family="Times New Roman">Parfois, la r\351solution explicite peut faire appara\356tre certaines fonctions analytiques inconnues du niveau coll\351gial. Soit  l'\351quation diff\351rentielle \340 variables s\351parables </Font><Equation input-equation="dy/dx=3y/(2*y^2+1)" style="2D Comment">NiMvKiYlI2R5RyIiIiUjZHhHISIiKigiIiRGJiUieUdGJiwmKiYiIiNGJiokRitGLkYmRiZGJkYmRig=</Equation><Font encoding="ISO8859-1" family="Times New Roman">. La solution g\351n\351rale est tr\350s facile \340 trouver en r\351solvant \253 papier-crayon \273. Voyons le r\351sultat que donnera l'\351valuateur dans la formulation explicite de la solution qu'il trouvera.</Font></Text-field><Group><Input><Text-field layout="Normal" prompt="&gt; " style="Maple Input">EDO:=Diff(y(x),x)=3*y(x)/(2*y(x)^2+1);</Text-field></Input></Group><Group><Input><Text-field layout="Normal" prompt="&gt; " style="Maple Input">Sol:=dsolve(EDO,y(x));</Text-field></Input></Group><Group><Input><Text-field layout="Normal" prompt="&gt; " style="Maple Input"/></Input></Group><Text-field layout="Normal" style="Normal"><Font encoding="ISO8859-1" family="Times New Roman">R\351solvons de nouveau mais en sp\351cifiant l'option </Font><Font style="_cstyle316">implicit</Font><Font family="Times New Roman">.</Font></Text-field><Group><Input><Text-field layout="Normal" prompt="&gt; " style="Maple Input">Sol:=dsolve(EDO,y(x),implicit);</Text-field></Input></Group><Text-field layout="Normal" style="Normal"><Font family="Times New Roman">Reformulons </Font><Font style="_cstyle314">Sol</Font><Font family="Times New Roman"> en termes de <Font style="_cstyle315">y</Font> et de C.</Font></Text-field><Group><Input><Text-field layout="Normal" prompt="&gt; " style="Maple Input">Sol_generale:=subs([y(x)=y,_C1=C],Sol);</Text-field></Input></Group><Group><Input><Text-field layout="Normal" prompt="&gt; " style="Maple Input"/></Input></Group></Section><Section collapsed="true"><Title><Text-field layout="Heading 2" style="Heading 2"><Font family="Times New Roman"> Solution avec condition initiale</Font></Text-field></Title><Text-field layout="Normal" style="Normal"><Font encoding="ISO8859-1" family="Times New Roman">La solution g\351n\351rale d'une \351quation diff\351rentielle d'ordre n contient n constantes arbitraires et ind\351pendantes. Une solution particuli\350re est une solution dans laquelle les constantes sont d\351termin\351es g\351n\351ralement \340 l'aide d'une ou de plusieurs hypoth\350ses sur </Font><Font family="Times New Roman" style="_cstyle265">y</Font><Font family="Times New Roman">, <Font style="_cstyle266">y'</Font>, <Font style="_cstyle268">y''</Font><Font encoding="ISO8859-1">, ... Ces hypoth\350ses sont appel\351es </Font><Font style="_cstyle282">conditions initiales</Font>.</Font></Text-field><Text-field layout="Normal" style="Normal"/><Text-field layout="Normal" style="Normal"><Font encoding="ISO8859-1" family="Times New Roman">Dans le cas des \351quations diff\351rentielles d'ordre 1 et de degr\351 1, une solution particuli\350re s'obtient en sp\351cifiant une valeur de la constante </Font><Font family="Times New Roman" style="_cstyle319">C</Font><Font family="Times New Roman">. Par exemple, en posant </Font><Equation input-equation="C = -5;" style="2D Comment">NiMvJSJDRywkIiImISIi</Equation><Font encoding="ISO8859-1" family="Times New Roman"> dans la solution g\351n\351rale </Font><Equation input-equation="y^2-x^2-C = 0;" style="2D Comment">NiMvLCgqJCUieUciIiMiIiIqJCUieEdGJyEiIiUiQ0dGKyIiIQ==</Equation><Font encoding="ISO8859-1" family="Times New Roman"> de l'\351quation diff\351rentielle </Font><Equation input-equation="x-y*dy/dx = 0" style="2D Comment">NiMvLCYlInhHIiIiKiglInlHRiYlI2R5R0YmJSNkeEchIiJGKyIiIQ==</Equation><Font encoding="ISO8859-1" family="Times New Roman">, on obtient la solution particuli\350re </Font><Equation input-equation="y^2-x^2+5 = 0;" style="2D Comment">NiMvLCgqJCUieUciIiMiIiIqJCUieEdGJyEiIiIiJkYoIiIh</Equation><Font family="Times New Roman">.</Font></Text-field><Text-field layout="Normal" style="Normal"/><Text-field layout="Normal" style="Normal"><Font encoding="ISO8859-1" family="Times New Roman">Il est possible aussi d'isoler des solutions particuli\350res en pr\351cisant des conditions initiales. Par exemple, soit la condition initiale pr\351cisant que </Font><Equation input-equation="y = 2;" style="2D Comment">NiMvJSJ5RyIiIw==</Equation><Font family="Times New Roman"> quand </Font><Equation input-equation="x = 3;" style="2D Comment">NiMvJSJ4RyIiJA==</Equation><Font encoding="ISO8859-1" family="Times New Roman">, c'est-\340-dire </Font><Equation input-equation="y(3) = 2;" style="2D Comment">NiMvLSUieUc2IyIiJCIiIw==</Equation><Font family="Times New Roman">.</Font></Text-field><Text-field layout="Normal" style="Normal"/><Text-field layout="Normal" style="Normal"><Font encoding="ISO8859-1" family="Times New Roman">Rappelons-nous l'\351quation \340 r\351soudre.</Font></Text-field><Group><Input><Text-field layout="Normal" prompt="&gt; " style="Maple Input">EDO:=x-y(x)*diff(y(x),x)=0;</Text-field></Input></Group><Text-field layout="Normal" style="Normal"><Font encoding="ISO8859-1" family="Times New Roman">R\351solvons avec </Font><Font style="_cstyle360">dsolve</Font><Font family="Times New Roman">.</Font></Text-field><Group><Input><Text-field layout="Normal" prompt="&gt; " style="Maple Input">Sol:=dsolve(EDO,y(x),implicit);</Text-field></Input></Group><Text-field layout="Normal" style="Normal"><Font encoding="ISO8859-1" family="Times New Roman">Reformulons de mani\350re habituelle ce r\351sultat.</Font></Text-field><Group><Input><Text-field layout="Normal" prompt="&gt; " style="Maple Input">Sol_generale:=subs([y(x)=y,_C1=C],Sol);</Text-field></Input></Group><Text-field layout="Normal" style="Normal"><Font family="Times New Roman">Obtenons la valeur de la constante <Font style="_cstyle361">C</Font><Font encoding="ISO8859-1"> impos\351e par la condition initiale </Font></Font><Equation input-equation="y(3)=2" style="2D Comment">NiMvLSUieUc2IyIiJCIiIw==</Equation><Font family="Times New Roman">.</Font></Text-field><Group><Input><Text-field layout="Normal" prompt="&gt; " style="Maple Input">C:=solve(subs([x=3,y=2],Sol_generale),C);</Text-field></Input></Group><Text-field layout="Normal" style="Normal"><Font family="Times New Roman">Puisque que <Font style="_cstyle362">C</Font><Font encoding="ISO8859-1"> est maintenant initialis\351e \340 la valeur 5, on obtient alors directement la solution particuli\350re correspondante.</Font></Font></Text-field><Group><Input><Text-field layout="Normal" prompt="&gt; " style="Maple Input">Sol_particuliere:=Sol_generale;</Text-field></Input></Group><Text-field layout="Normal" style="Normal"><Font encoding="ISO8859-1" family="Times New Roman">Rendons \340 nouveau la variable </Font><Font family="Times New Roman" style="_cstyle363">C</Font><Font family="Times New Roman"> libre.</Font></Text-field><Group><Input><Text-field layout="Normal" prompt="&gt; " style="Maple Input">C:='C':</Text-field></Input></Group><Group><Input><Text-field layout="Normal" prompt="&gt; " style="Maple Input"/></Input></Group><Text-field layout="Normal" style="Normal"><Font family="Times New Roman">La condition initiale </Font><Equation input-equation="y(3) = 2;" style="2D Comment">NiMvLSUieUc2IyIiJCIiIw==</Equation><Font encoding="ISO8859-1" family="Times New Roman"> a d\351termin\351e </Font><Equation input-equation="C = -5;" style="2D Comment">NiMvJSJDRywkIiImISIi</Equation><Font family="Times New Roman">. Il y a donc une correspondance entre la condition initiale </Font><Equation input-equation="y(3)=2" style="2D Comment">NiMvLSUieUc2IyIiJCIiIw==</Equation><Font family="Times New Roman"> et la valeur 5 de la constante <Font style="_cstyle364">C</Font>.</Font></Text-field><Text-field layout="Normal" style="Normal"/><Text-field layout="Normal" style="Normal"><Font family="Times New Roman">La macro-commande </Font><Font style="_cstyle269">dsolve</Font><Font encoding="ISO8859-1" family="Times New Roman"> permet \351galement la r\351solution d'une \351quation diff\351rentielle avec conditions initiales. R\351solvons de nouveau l'\351quation </Font><Equation input-equation="x-y*dy/dx = 0;" style="2D Comment">NiMvLCYlInhHIiIiKiglInlHRiYlI2R5R0YmJSNkeEchIiJGKyIiIQ==</Equation><Font encoding="ISO8859-1" family="Times New Roman"> mais cette fois-ci, trouvons la solution particuli\350re satisfaisant la condition initiale </Font><Equation input-equation="y(3)=2" style="2D Comment">NiMvLSUieUc2IyIiJCIiIw==</Equation><Font family="Times New Roman">.</Font></Text-field><Text-field layout="Normal" style="Normal"/><Text-field layout="Normal" style="Normal"><Font family="Times New Roman">Le premier argument de </Font><Font style="_cstyle321">dsolve</Font><Font encoding="ISO8859-1" family="Times New Roman">, entre accolades, devra toujours sp\351cifier l'\351quation diff\351rentielle \340 r\351soudre accompagn\351e de toutes les hypoth\350ses sur </Font><Font family="Times New Roman" style="_cstyle267">y</Font><Font encoding="ISO8859-1" family="Times New Roman"> et/ou ses d\351riv\351es. (Voir </Font><Hyperlink family="Times New Roman" hyperlink="true" linktarget="Help:dsolve,ics" style="Hyperlink">dsolve,ics</Hyperlink><Font family="Times New Roman">)</Font></Text-field><Group><Input><Text-field layout="Normal" prompt="&gt; " style="Maple Input">Sol_particuliere:=dsolve({EDO,y(3)=2},y(x));</Text-field></Input></Group><Text-field layout="Normal" style="Normal"><Font encoding="ISO8859-1" family="Times New Roman">En r\351solvant \253 papier-crayon \273 cette \351quation, la solution particuli\350re est plut\364t formul\351e par  </Font><Equation input-equation="y^2-x^2+5 = 0" style="2D Comment">NiMvLCgqJCUieUciIiMiIiIqJCUieEdGJyEiIiIiJkYoIiIh</Equation><Font encoding="ISO8859-1" family="Times New Roman">. Or, l'\351valuateur, au lieu de produire la solution particuli\350re implicite </Font><Equation input-equation="y^2-x^2+5 = 0" style="2D Comment">NiMvLCgqJCUieUciIiMiIiIqJCUieEdGJyEiIiIiJkYoIiIh</Equation><Font encoding="ISO8859-1" family="Times New Roman">, a donn\351 pour r\351sultat </Font><Font family="Times New Roman" style="_cstyle286">l'une des formulations explicites de</Font><Font family="Times New Roman">  </Font><Equation input-equation="y^2-x^2-C_1 = 0;" style="_cstyle283">NiMvLCgqJCUieUciIiMiIiIqJCUieEdGJyEiIiUkQ18xR0YrIiIh</Equation><Font family="Times New Roman"> <Font style="_cstyle284">satisfaisant la condition initiale </Font></Font><Equation input-equation="y(3) = 2" style="_cstyle285">NiMvLSUieUc2IyIiJCIiIw==</Equation><Font encoding="ISO8859-1" family="Times New Roman">, c'est-\340-dire  </Font><Equation input-equation="y = sqrt(x^2-5);" style="2D Comment">NiMvJSJ5Ry0lJXNxcnRHNiMsJiokJSJ4RyIiIyIiIiIiJiEiIg==</Equation><Font family="Times New Roman">. Les trois conditions initiales </Font><Font style="_cstyle21">y(-3) = 2, y(3)=-2 et y(-3) = -2 </Font><Font encoding="ISO8859-1" family="Times New Roman">am\350ne \351galement l'une ou l'autre des solutions explicites obtenues de la solution g\351n\351rale avec la constante \351gale \340 </Font><Equation input-equation="-5" style="2D Comment">NiMsJCIiJiEiIg==</Equation><Font family="Times New Roman">.</Font></Text-field><Group><Input><Text-field layout="Normal" prompt="&gt; " style="Maple Input">Sol_particuliere_2:=dsolve({EDO,y(-3)=2},y(x));
Sol_particuliere_3:=dsolve({EDO,y(3)=-2},y(x));
Sol_particuliere_4:=dsolve({EDO,y(-3)=-2},y(x));</Text-field></Input></Group><Group><Input><Text-field layout="Normal" prompt="&gt; " style="Maple Input"/></Input></Group><Text-field layout="Normal" style="Normal"><Font encoding="ISO8859-1" family="Times New Roman">Par d\351faut et sous certaines conditions, la macro-commande </Font><Font style="_cstyle281">dsolve</Font><Font encoding="ISO8859-1" family="Times New Roman"> r\351soud explicitement. C'est ce qui explique le r\351sultat pr\351c\351dent. En somme, il faudra donc \352tre circonspect lorsqu'il s'agira d'obtenir une solution particuli\350re avec Maple. Heureusement, que </Font><Font style="_cstyle271">dsolve</Font><Font encoding="ISO8859-1" family="Times New Roman"> est "sensible" \340 la variable d'environnement  </Font><Font style="_cstyle272">_EnvExplicit</Font><Font encoding="ISO8859-1" family="Times New Roman">. Trouvons de nouveau la solution particuli\350re en initialisant au pr\351alable la variable </Font><Font style="_cstyle273">_EnvExplicit_</Font><Font encoding="ISO8859-1" family="Times New Roman">  \340 </Font><Font style="_cstyle274">false</Font><Font family="Times New Roman">.</Font></Text-field><Text-field layout="Normal" style="Normal"/><Text-field layout="Normal" style="Normal"><Font family="Times New Roman">Initialisons de nouveau la session Maple avec </Font><Font style="_cstyle280">restart</Font><Font family="Times New Roman">.</Font></Text-field><Group><Input><Text-field layout="Normal" prompt="&gt; " style="Maple Input">restart;
</Text-field></Input></Group><Group><Input><Text-field layout="Normal" prompt="&gt; " style="Maple Input">_EnvExplicit:=false:
</Text-field></Input></Group><Group><Input><Text-field layout="Normal" prompt="&gt; " style="Maple Input">EDO:=x-y(x)*D(y)(x)=0;</Text-field></Input></Group><Group><Input><Text-field layout="Normal" prompt="&gt; " style="Maple Input">Sol_particuliere:=dsolve({EDO,y(3)=2},y(x));</Text-field></Input></Group><Text-field layout="Normal" style="Normal"><Font family="Times New Roman">En traduisant par </Font><Equation input-equation="y^2" style="2D Comment">NiMqJCUieUciIiM=</Equation><Font family="Times New Roman">  la variable </Font><Equation input-equation="_Z^2" style="2D Comment">NiMqJCUjX1pHIiIj</Equation><Font encoding="ISO8859-1" family="Times New Roman"> cr\351\351e par Maple, on a donc la solution particuli\350re implicite </Font><Equation input-equation="y^2-x^2+5 = 0" style="2D Comment">NiMvLCgqJCUieUciIiMiIiIqJCUieEdGJyEiIiIiJkYoIiIh</Equation><Font encoding="ISO8859-1" family="Times New Roman"> formul\351e en terme de la macro-commande </Font><Font style="_cstyle365">RootOf</Font><Font family="Times New Roman">.</Font></Text-field><Text-field layout="Normal" style="Normal"><Font family="Times New Roman">Montrons, avec la macro-commande<Font style="_cstyle287"> </Font></Font><Font style="_cstyle288">allvalues</Font><Font encoding="ISO8859-1" family="Times New Roman">, que la formulation explicite de l'\351quation  </Font><Equation input-equation="y(x) = RootOf(_Z^2-x^2+5)" style="2D Comment">NiMvLSUieUc2IyUieEctJSdSb290T2ZHNiMsKCokJSNfWkciIiMiIiIqJEYnRi4hIiIiIiZGLw==</Equation><Font encoding="ISO8859-1" family="Times New Roman"> correspond effectivement aux deux formulations explicites de la solution particuli\350re </Font><Equation input-equation="y^2-x^2+5 = 0" style="2D Comment">NiMvLCgqJCUieUciIiMiIiIqJCUieEdGJyEiIiIiJkYoIiIh</Equation><Font family="Times New Roman">.</Font></Text-field><Group><Input><Text-field layout="Normal" prompt="&gt; " style="Maple Input">### WARNING: allvalues now returns a list of symbolic values instead of a sequence of lists of numeric values
allvalues(Sol_particuliere);</Text-field></Input></Group><Group><Input><Text-field layout="Normal" prompt="&gt; " style="Maple Input"/></Input></Group><Text-field layout="Normal" style="Normal"><Font family="Times New Roman">La macro-commande </Font><Hyperlink family="Times New Roman" hyperlink="true" linktarget="Help:odetest" style="Hyperlink">odetest</Hyperlink><Font encoding="ISO8859-1" family="Times New Roman"> de la biblioth\350que de base permet la v\351rification des solutions implicites et explicites qui ont \351t\351 obtenus avec </Font><Font style="_cstyle279">dsolve</Font><Font encoding="ISO8859-1" family="Times New Roman">. Si l'\351quation est v\351rifi\351e, </Font><Font style="_cstyle275">odetest</Font><Font encoding="ISO8859-1" family="Times New Roman"> donnera comme r\351sultat la valeur 0. V\351rifions d'abord la solution particuli\350re implicite.</Font></Text-field><Group><Input><Text-field layout="Normal" prompt="&gt; " style="Maple Input">odetest(Sol_particuliere,EDO);</Text-field></Input></Group><Group><Input><Text-field layout="Normal" prompt="&gt; " style="Maple Input"/></Input></Group><Text-field layout="Normal" style="Normal"><Font encoding="ISO8859-1" family="Times New Roman">Contr\364lons maintenant les deux solutions particuli\350res explicitent. \300 l'aide de la macro-commmande </Font><Font style="_cstyle366">map</Font><Font family="Times New Roman">, appliquons </Font><Font style="_cstyle367">odetest</Font><Font encoding="ISO8859-1" family="Times New Roman"> sur chacune des deux solutions particuli\350res explicites.</Font></Text-field><Group><Input><Text-field layout="Normal" prompt="&gt; " style="Maple Input">### WARNING: allvalues now returns a list of symbolic values instead of a sequence of lists of numeric values
map(odetest,[allvalues(Sol_particuliere)],EDO);</Text-field></Input></Group><Text-field layout="Normal" style="Normal"><Font encoding="ISO8859-1" family="Times New Roman">Les deux solutions particuli\350res explicites v\351rifient donc l'\351quation diff\351rentielle EDO.</Font></Text-field><Group><Input><Text-field layout="Normal" prompt="&gt; " style="Maple Input"/></Input></Group></Section></Section><Section collapsed="true"><Title><Text-field layout="Heading 1" style="Heading 1"><Font encoding="ISO8859-1" family="Times New Roman"> Interpr\351tation graphique</Font></Text-field></Title><Text-field layout="Normal" style="Normal"><Font encoding="ISO8859-1" family="Times New Roman">La solution g\351n\351rale d'une \351quation diff\351rentielle consiste en une famille de courbes qui satisfait l'\351quation diff\351rentielle donn\351e et chacune de ces courbes repr\351sente une solution particuli\350re. Illustrons quelques solutions particuli\350res implicites de l'\351quation diff\351rentielle  </Font><Equation input-equation="x-y*dy/dx = 0;" style="2D Comment">NiMvLCYlInhHIiIiKiglInlHRiYlI2R5R0YmJSNkeEchIiJGKyIiIQ==</Equation><Font family="Times New Roman">.</Font></Text-field><Text-field layout="Normal" style="Normal"/><Text-field layout="Normal" style="Normal"><Font encoding="ISO8859-1" family="Times New Roman">Afin de nous rappeler la r\351solution en cours, ex\351cutons de nouveau les trois requ\352tes suivantes. </Font></Text-field><Group><Input><Text-field layout="Normal" prompt="&gt; " style="Maple Input">EDO:=x-y(x)*D(y)(x)=0;</Text-field></Input></Group><Text-field layout="Normal" style="Normal"><Font encoding="ISO8859-1" family="Times New Roman">On doit r\351soudre EDO de fa\347on implicite. Initialisons  </Font><Font style="_cstyle276">_EnvExplicit </Font><Font encoding="ISO8859-1" family="Times New Roman">avec la valeur de v\351rit\351 </Font><Font style="_cstyle277">false</Font><Font family="Times New Roman">.</Font></Text-field><Group><Input><Text-field layout="Normal" prompt="&gt; " style="Maple Input">_EnvExplicit:=false;</Text-field></Input></Group><Group><Input><Text-field layout="Normal" prompt="&gt; " style="Maple Input">Sol:=dsolve(EDO);</Text-field></Input></Group><Text-field layout="Normal" style="Normal"><Font family="Times New Roman">Reformulons </Font><Font style="_cstyle339">Sol</Font><Font family="Times New Roman"> en termes de <Font style="_cstyle340">y</Font> et de C.</Font></Text-field><Group><Input><Text-field layout="Normal" prompt="&gt; " style="Maple Input">Sol_generale:=subs([y(x)=y,_C1=C],Sol);</Text-field></Input></Group><Text-field layout="Normal" style="Normal"><Font encoding="ISO8859-1" family="Times New Roman">Maintenant, tra\347ons quelques solutions particuli\350res de cette famille avec </Font><Equation input-equation="_C1 = -8;" style="2D Comment">NiMvJSRfQzFHLCQiIikhIiI=</Equation><Font family="Times New Roman">, -5, 5, 15. </Font></Text-field><Text-field layout="Normal" style="Normal"><Font encoding="ISO8859-1" family="Times New Roman">Puisque chaque solution particuli\350re d\351finit </Font><Font family="Times New Roman" style="_cstyle341">y</Font><Font family="Times New Roman"> implicitement comme fonction de <Font style="_cstyle342">x</Font>, employons la macro-commande </Font><Font style="_cstyle343">impliciplot</Font><Font family="Times New Roman"> de l'extension </Font><Font style="_cstyle344">plots</Font><Font family="Times New Roman">.</Font></Text-field><Group><Input><Text-field layout="Normal" prompt="&gt; " style="Maple Input">with(plots,implicitplot);</Text-field></Input></Group><Text-field layout="Normal" style="Normal"><Font encoding="ISO8859-1" family="Times New Roman">Initialisons la premi\350re valeur de </Font><Font family="Times New Roman" style="_cstyle323">C</Font><Font encoding="ISO8859-1" family="Times New Roman"> et tra\347ons implicitement l'\351quation </Font><Font style="_cstyle324">Sol_generale</Font><Font family="Times New Roman">.</Font></Text-field><Group><Input><Text-field layout="Normal" prompt="&gt; " style="Maple Input">C:=-8:
Courbe1:=implicitplot(Sol_generale,x=-5..5,y=-5..5,color=orange):
Courbe1;</Text-field></Input></Group><Group><Input><Text-field layout="Normal" prompt="&gt; " style="Maple Input"/></Input></Group><Text-field layout="Normal" style="Normal"><Font encoding="ISO8859-1" family="Times New Roman">On pourrait tr\350s bien cr\351er les trois autres courbes demand\351es (avec </Font><Font family="Times New Roman" style="_cstyle322">C</Font><Font encoding="ISO8859-1" family="Times New Roman"> = -5, 5 et 15) de cette fa\347on et r\351aliser ensuite dans un m\352me graphique la superposition de ces quatre trac\351s. Mais, pour plus d'efficacit\351, automatisons cette t\342che r\351p\351titive. La boucle suivante va faciliter la cr\351ation des quatre structures graphiques correspondant aux quatre valeurs de C retenues. En Maple V, l'op\351rateur de concat\351nation est le point \253 . \273 tandis qu'\340 partir de Maple 6, cet op\351rateur est les deux barres verticales \253 || \273.</Font></Text-field><Text-field layout="Normal" style="Normal"/><Text-field layout="Normal" style="Normal"><Font encoding="ISO8859-1" family="Times New Roman">Cr\351ons d'abord la liste des valeurs que la constante C prendra.</Font></Text-field><Group><Input><Text-field layout="Normal" prompt="&gt; " style="Maple Input">Valeurs_de_C:=[-8,-5,5,15];</Text-field></Input></Group><Text-field layout="Normal" style="Normal"><Font encoding="ISO8859-1" family="Times New Roman">Ensuite, avec une boucle, cr\351ons les quatre trac\351s.</Font></Text-field><Group><Input><Text-field layout="Normal" prompt="&gt; " style="Maple Input">for i from 1 to nops(Valeurs_de_C) do
 C:=Valeurs_de_C[i];
 Courbe||i:= implicitplot(Sol_generale,x=-5..5,y=-5..5,color=orange,thickness=2);
od:
C:='C':    # Pour rendre C libre
i:='i':    # Pour rendre i libre</Text-field></Input></Group><Text-field layout="Normal" style="Normal"><Font encoding="ISO8859-1" family="Times New Roman">\300 l'aide de la macro-commande </Font><Font style="_cstyle368">display</Font><Font family="Times New Roman"> de l'extension </Font><Font style="_cstyle369">plots</Font><Font encoding="ISO8859-1" family="Times New Roman">, affichons la superposition de ces quatres trac\351s.</Font></Text-field><Group><Input><Text-field layout="Normal" prompt="&gt; " style="Maple Input">with(plots,display):</Text-field></Input></Group><Group><Input><Text-field layout="Normal" prompt="&gt; " style="Maple Input">Famille:=display(Courbe||(1..nops(Valeurs_de_C)),scaling=constrained):
Famille;</Text-field></Input></Group><Group><Input><Text-field layout="Normal" prompt="&gt; " style="Maple Input"/></Input></Group><Text-field layout="Normal" style="Normal"><Font encoding="ISO8859-1" family="Times New Roman">On peut tr\350s bien employer la macro-commande </Font><Font style="_cstyle325">contourplot</Font><Font family="Times New Roman"> de l'extension </Font><Font style="_cstyle326">plots</Font><Font encoding="ISO8859-1" family="Times New Roman"> pour r\351aliser plus directement la superposition de ces quatres trac\351s. En effet, la solution g\351n\351rale peut, d'un certain point de vue, \352tre consid\351r\351e comme une fonction F de deux variables d\351finit par </Font><Equation input-equation="F(x,y)=y^2-x^2" style="2D Comment">NiMvLSUiRkc2JCUieEclInlHLCYqJEYoIiIjIiIiKiRGJ0YrISIi</Equation><Font family="Times New Roman">.</Font></Text-field><Group><Input><Text-field layout="Normal" prompt="&gt; " style="Maple Input">Formule:=solve(Sol_generale,C);</Text-field></Input></Group><Group><Input><Text-field layout="Normal" prompt="&gt; " style="Maple Input">with(plots,contourplot):</Text-field></Input></Group><Group><Input><Text-field layout="Normal" prompt="&gt; " style="Maple Input">Famille:=contourplot(Formule,x=-5..5,y=-5..5,grid=[70,70],
		                           contours=Valeurs_de_C,color=orange,thickness=2):</Text-field></Input></Group><Group><Input><Text-field layout="Normal" prompt="&gt; " style="Maple Input">display(Famille,axes=normal,scaling=constrained);</Text-field></Input></Group><Group><Input><Text-field layout="Normal" prompt="&gt; " style="Maple Input"/></Input></Group><Text-field layout="Normal" style="Normal"><Font encoding="ISO8859-1" family="Times New Roman">Si vous \352tes un tantinet patient (environ 60s avec PII, 400Mhz), vous pouvez m\352me mettre un peu de couleurs en employant </Font><Font style="_cstyle345">contourplot</Font><Font family="Times New Roman">.</Font></Text-field><Group><Input><Text-field layout="Normal" prompt="&gt; " style="Maple Input">Famille:=contourplot(Formule,x=-5..5,y=-5..5,grid=[70,70],thickness=2,
		                   contours=Valeurs_de_C,coloring=[yellow,pink],filled=true):</Text-field></Input></Group><Group><Input><Text-field layout="Normal" prompt="&gt; " style="Maple Input">display(Famille,axes=normal,scaling=constrained);</Text-field></Input></Group><Group><Input><Text-field layout="Normal" prompt="&gt; " style="Maple Input"/></Input></Group><Text-field layout="Normal" style="Normal"><Font encoding="ISO8859-1" family="Times New Roman">Pour mettre en \351vidence une solution particuli\350re, par exemple correspondant \340 </Font><Equation input-equation="C = -1;" style="2D Comment">NiMvJSJDRywkIiIiISIi</Equation><Font encoding="ISO8859-1" family="Times New Roman">, il suffit de tracer s\351par\351ment cette solution particuli\350re puis de superposer son trac\351 avec celui de la famille.</Font></Text-field><Group><Input><Text-field layout="Normal" prompt="&gt; " style="Maple Input">C:=-1:
Sol_particuliere:=implicitplot(Sol_generale,x=-5..5,y=-5..5,
                  color=magenta,thickness=3):
C:='C':   # Pour rendre C libre</Text-field></Input></Group><Group><Input><Text-field layout="Normal" prompt="&gt; " style="Maple Input">display([Sol_particuliere,Famille],scaling=constrained);</Text-field></Input></Group><Group><Input><Text-field layout="Normal" prompt="&gt; " style="Maple Input"/></Input></Group></Section><Section collapsed="true"><Title><Text-field layout="Heading 1" style="Heading 1"><Font encoding="ISO8859-1" family="Times New Roman"> Champ des \351l\351ments de contact</Font></Text-field></Title><Text-field layout="Normal" style="Normal"><Font encoding="ISO8859-1" family="Times New Roman">Une \351quation diff\351rentielle ordinaire du premier ordre et du premier degr\351 est une \351quation de la forme </Font><Equation input-equation="dy/dx = f(x,y);" style="2D Comment">NiMvKiYlI2R5RyIiIiUjZHhHISIiLSUiZkc2JCUieEclInlH</Equation><Font encoding="ISO8859-1" family="Times New Roman">.  En se rappelant l'interpr\351tation graphique de </Font><Equation input-equation="dy/dx" style="2D Comment">NiMqJiUjZHlHIiIiJSNkeEchIiI=</Equation><Font family="Times New Roman">,  f(<Font style="_cstyle294">x</Font>,<Font style="_cstyle295">y</Font><Font encoding="ISO8859-1">) est donc une formule donnant la pente de la tangente \340 la courbe solution passant par le point (</Font><Font style="_cstyle296">x</Font>,<Font style="_cstyle297">y</Font><Font encoding="ISO8859-1">). Ainsi, l'\351quation diff\351rentielle </Font></Font><Equation input-equation="x-y*dy/dx = 0;" style="2D Comment">NiMvLCYlInhHIiIiKiglInlHRiYlI2R5R0YmJSNkeEchIiJGKyIiIQ==</Equation><Font encoding="ISO8859-1" family="Times New Roman"> (de mani\350re \351quivalente </Font><Equation input-equation="dy/dx=x/y" style="2D Comment">NiMvKiYlI2R5RyIiIiUjZHhHISIiKiYlInhHRiYlInlHRig=</Equation><Font encoding="ISO8859-1" family="Times New Roman"> ) peut \352tre visualis\351e par un graphique appel\351 <Font style="_cstyle303">champ des \351l\351ments de contact</Font></Font><Font family="Times New Roman">.</Font></Text-field><Text-field layout="Normal" style="Normal"/><Text-field layout="Normal" style="Normal"><Font encoding="ISO8859-1" family="Times New Roman">Chaque \351l\351ment de ce champ est un petit segment de droite centr\351 au point (</Font><Equation input-equation="x[0],y[0]" style="2D Comment">NiQmJSJ4RzYjIiIhJiUieUdGJQ==</Equation><Font family="Times New Roman">) d'orientation f(</Font><Equation input-equation="x[0], y[0]" style="2D Comment">NiQmJSJ4RzYjIiIhJiUieUdGJQ==</Equation><Font family="Times New Roman">).</Font></Text-field><Text-field layout="Normal" style="Normal"/><Text-field layout="Normal" style="Normal"><Font encoding="ISO8859-1" family="Times New Roman">Ainsi, pour l'\351quation diff\351rentielle  </Font><Equation input-equation="dy/dx = x/y;" style="2D Comment">NiMvKiYlI2R5RyIiIiUjZHhHISIiKiYlInhHRiYlInlHRig=</Equation><Font encoding="ISO8859-1" family="Times New Roman">, au point (2,1), la pente de la tangente \340 la courbe de la solution particuli\350re passant par ce point est  </Font><Equation input-equation="dy/dx = 2/1;" style="2D Comment">NiMvKiYlI2R5RyIiIiUjZHhHISIiKiYiIiNGJkYmRig=</Equation><Font encoding="ISO8859-1" family="Times New Roman">.  Au point (2,2) la pente de la tangente \340 la courbe de la solution particuli\350re passant par ce point est </Font><Equation input-equation="1;" style="2D Comment">NiMiIiI=</Equation><Font encoding="ISO8859-1" family="Times New Roman">. Dans le premier cas, on illustre le r\351sultat par un petit segment de droite centr\351 en (2,1) de pente </Font><Equation input-equation="2;" style="2D Comment">NiMiIiM=</Equation><Font encoding="ISO8859-1" family="Times New Roman"> et, dans le second cas, par un autre segment de droite centr\351 en (2,2) de pente </Font><Equation input-equation="1;" style="2D Comment">NiMiIiI=</Equation><Font encoding="ISO8859-1" family="Times New Roman">. En r\351p\351tant ce processus avec un certain quadrillage de couples (</Font><Font family="Times New Roman" style="_cstyle298">x</Font><Font family="Times New Roman">,<Font style="_cstyle299">y</Font><Font encoding="ISO8859-1">) r\351guli\350rement espac\351, on obtient ce qu'on appelle un <Font style="_cstyle304">champ d'\351l\351ments de contact</Font>, parfois traduit litt\351ralement de l'anglais par champ de pentes.</Font></Font></Text-field><Text-field layout="Normal" style="Normal"/><Text-field layout="Normal" style="Normal"><Font family="Times New Roman">La macro-commande </Font><Hyperlink family="Times New Roman" hyperlink="true" linktarget="Help:dfieldplot" style="Hyperlink">dfieldplot</Hyperlink><Font family="Times New Roman"> de l'extension  </Font><Font style="_cstyle289">DEtools</Font><Font encoding="ISO8859-1" family="Times New Roman"> permet le trac\351 d'un champ d'\351l\351ments de contact. L'extension </Font><Font style="_cstyle290">DEtools</Font><Font encoding="ISO8859-1" family="Times New Roman"> impose la formulation fonctionnelle de la variable d\351pendante. Dans le cas d'une fonction de deux variables </Font><Font family="Times New Roman" style="_cstyle291">x</Font><Font family="Times New Roman"> et <Font style="_cstyle292">y</Font>, si la variable <Font style="_cstyle293">y</Font><Font encoding="ISO8859-1"> est d\351sign\351e comme d\351pendante, on doit donc l'\351noncer dans les requ\352tes avec la syntaxe fonctionnelle </Font></Font><Equation input-equation="y(x)" style="2D Comment">NiMtJSJ5RzYjJSJ4Rw==</Equation><Font family="Times New Roman">.</Font></Text-field><Group><Input><Text-field layout="Normal" prompt="&gt; " style="Maple Input">with(DEtools,dfieldplot);</Text-field></Input></Group><Group><Input><Text-field layout="Normal" prompt="&gt; " style="Maple Input">Champ:=dfieldplot(EDO,[y(x)],x=-6..6,y=-6..6,
       arrows=line,dirgrid=[20,20],color=orange,
       scaling=constrained):</Text-field></Input></Group><Group><Input><Text-field layout="Normal" prompt="&gt; " style="Maple Input">Champ;</Text-field></Input></Group><Group><Input><Text-field layout="Normal" prompt="&gt; " style="Maple Input"/></Input></Group><Text-field layout="Normal" style="Normal"><Font encoding="ISO8859-1" family="Times New Roman">On peut \351galement repr\351senter dans un champ d'\351l\351ments de contact, des courbes appel\351es </Font><Font family="Times New Roman" style="_cstyle305">isoclines</Font><Font family="Times New Roman"> ( du grec <Font style="_cstyle300">iso</Font><Font encoding="ISO8859-1"> qui signifie m\352me et du latin </Font><Font style="_cstyle301">clinare</Font><Font encoding="ISO8859-1"> qui signifie pencher). Les isoclines sont des courbes le long desquelles les \351l\351ments de contact ont une direction ( une inclinaison ) donn\351e.</Font></Font></Text-field><Text-field layout="Normal" style="Normal"/><Text-field layout="Normal" style="Normal"><Font encoding="ISO8859-1" family="Times New Roman">Superposer, dans le champ d'\351l\351ments de contact pr\351c\351dent, les isoclines de pente  -3, </Font><Equation input-equation="1/3" style="2D Comment">NiMqJiIiIkYkIiIkISIi</Equation><Font family="Times New Roman"> et 2.</Font></Text-field><Text-field layout="Normal" style="Normal"><Font encoding="ISO8859-1" family="Times New Roman">Pour obtenir de meilleurs trac\351, tra\347ons plut\364t les isoclines avec la macro-commande </Font><Font style="_cstyle327">plot</Font><Font encoding="ISO8859-1" family="Times New Roman"> en tra\347ant </Font><Equation input-equation="y=x/Pentes" style="2D Comment">NiMvJSJ5RyomJSJ4RyIiIiUnUGVudGVzRyEiIg==</Equation><Font encoding="ISO8859-1" family="Times New Roman">  au lieu de tracer des \351quations de la forme </Font><Equation input-equation="Pentes=x/y" style="2D Comment">NiMvJSdQZW50ZXNHKiYlInhHIiIiJSJ5RyEiIg==</Equation><Font family="Times New Roman">  avec la macro-commande </Font><Font style="_cstyle306">implicitplot</Font><Font family="Times New Roman"> car <Font style="_cstyle329">y</Font><Font encoding="ISO8859-1"> peut \352tre explicit\351e de mani\350re unique en termes de </Font><Font style="_cstyle330">x</Font>.</Font></Text-field><Group><Input><Text-field layout="Normal" prompt="&gt; " style="Maple Input">Pentes:=[-3,1/3,2];</Text-field></Input></Group><Group><Input><Text-field layout="Normal" prompt="&gt; " style="Maple Input">for i from 1 to nops(Pentes) do
 isocline||i:=plot([x,x/Pentes[i]],x=-6..6,thickness=2,color=navy):
od:
i:='i':   # Pour rendre i libre</Text-field></Input></Group><Group><Input><Text-field layout="Normal" prompt="&gt; " style="Maple Input"><Font encoding="ISO8859-1">display({isocline||(1..nops(Pentes)),Champ},view=[-6..6,-6..6],title="Isoclines d'\351quations x/y=Pentes");</Font></Text-field></Input></Group><Group><Input><Text-field layout="Normal" prompt="&gt; " style="Maple Input"/></Input></Group><Text-field layout="Normal" style="Normal"><Font encoding="ISO8859-1" family="Times New Roman">L'int\351r\352t d'un champ d'\351l\351ments de contact appara\356t clairement avec l'usage de l'ordinateur. Que l'\351quation diff\351rentielle poss\350de ou non une solution analytique, ce type de trac\351 permet de visualiser les trajectoires des courbes solution d'une \351quation diff\351rentielle.</Font></Text-field><Text-field layout="Normal" style="Normal"/><Text-field layout="Normal" style="Normal"><Font encoding="ISO8859-1" family="Times New Roman">Superposons au champ d'\351l\351ments de contact pr\351c\351dent, les solutions particuli\350res correspondant aux conditions initiales donnant C =  </Font><Equation input-equation="-8" style="2D Comment">NiMsJCIiKSEiIg==</Equation><Font family="Times New Roman">, </Font><Equation input-equation="-5" style="2D Comment">NiMsJCIiJiEiIg==</Equation><Font family="Times New Roman">, 5 et 15.</Font></Text-field><Group><Input><Text-field layout="Normal" prompt="&gt; " style="Maple Input"><Font encoding="ISO8859-1">display([Famille,Champ],title="Solutions particuli\350res de x-y*dy/dx = 0",titlefont=[TIMES,ROMAN,12]);</Font></Text-field></Input></Group><Group><Input><Text-field layout="Normal" prompt="&gt; " style="Maple Input"/></Input></Group><Text-field layout="Normal" style="Normal"><Font family="Times New Roman">La macro-commande </Font><Hyperlink family="Times New Roman" hyperlink="true" linktarget="Help:DEplot" style="Hyperlink">DEplot</Hyperlink><Font family="Times New Roman"> de l'extension </Font><Font style="_cstyle302">DEtools</Font><Font encoding="ISO8859-1" family="Times New Roman"> permet automatiquement la superposition du trac\351 d'un champ d'\351l\351ments de contact avec les trac\351s des solutions particuli\350res. </Font></Text-field><Group><Input><Text-field layout="Normal" prompt="&gt; " style="Maple Input">with(DEtools,DEplot);</Text-field></Input></Group><Text-field layout="Normal" style="Normal"><Font family="Times New Roman" style="_cstyle307">Attention</Font><Font family="Times New Roman">: </Font><Font style="_cstyle331">Deplot</Font><Font encoding="ISO8859-1" family="Times New Roman"> r\351soud explicitement m\352me si la variable d'environnement </Font><Font style="_cstyle346">_EnvExplicit</Font><Font encoding="ISO8859-1" family="Times New Roman"> est initialis\351e \340 </Font><Font style="_cstyle347">false</Font><Font encoding="ISO8859-1" family="Times New Roman">. Dans le cas o\371 la solution g\351n\351rale explicite n'est pas unique, le tra\347age des solutions particuli\350res doit \352tre limit\351 aux quadrants respectifs sp\351cifi\351s par les conditions initiales. Ainsi, pour la solution particuli\350re correspondant \340 la condition initiale </Font><Equation input-equation="y(3)=2" style="2D Comment">NiMvLSUieUc2IyIiJCIiIw==</Equation><Font family="Times New Roman"> et </Font><Equation input-equation="y(3)=-2" style="2D Comment">NiMvLSUieUc2IyIiJCwkIiIjISIi</Equation><Font encoding="ISO8859-1" family="Times New Roman">, nous devons faire la superposition de deux trac\351s.</Font></Text-field><Group><Input><Text-field layout="Normal" prompt="&gt; " style="Maple Input">C1:=DEplot(EDO,y(x),x=0..6,[[y(3)=2]],y=-0.001..6,linecolor=navy,color=khaki,scaling=constrained,arrows=line,dirgrid=[20,20]):
C2:=DEplot(EDO,y(x),x=0..6,[[y(3)=-2]],y=-6..0,linecolor=navy,color=khaki,scaling=constrained,arrows=line,dirgrid=[20,20]):</Text-field></Input></Group><Group><Input><Text-field layout="Normal" prompt="&gt; " style="Maple Input">display([C1,C2]);
</Text-field></Input></Group><Group><Input><Text-field layout="Normal" prompt="&gt; " style="Maple Input"/></Input></Group><Text-field layout="Normal" style="Normal"><Font encoding="ISO8859-1" family="Times New Roman">Pour le trac\351 pr\351c\351dent, il a fallu pr\351ciser l'intervalle </Font><Equation input-equation="y=-0.001..6" style="2D Comment">NiMvJSJ5RzssJCQiIiIhIiQhIiIiIic=</Equation><Font family="Times New Roman">. au lieu de </Font><Equation input-equation="y=0..6" style="2D Comment">NiMvJSJ5RzsiIiEiIic=</Equation><Font encoding="ISO8859-1" family="Times New Roman"> pour faire appara\356tre le champ d'\351l\351ments de contact.</Font></Text-field><Text-field layout="Normal" style="Normal"/><Text-field layout="Normal" style="Normal"><Font encoding="ISO8859-1" family="Times New Roman">Si on essait de le faire d'un seul jet, c'est-\340-dire sans se limiter au seul quadrant correspondant \340 la condition initiale, voici ce que cela donne.</Font></Text-field><Group><Input><Text-field layout="Normal" prompt="&gt; " style="Maple Input">DEplot(EDO,y(x),x=0..6,[[y(3)=-2]],y=-6..6,linecolor=navy,color=khaki,scaling=constrained,arrows=line,dirgrid=[20,20]);</Text-field></Input></Group><Text-field layout="Normal" style="Normal"><Font family="Times New Roman">Horrible!</Font></Text-field><Group><Input><Text-field layout="Normal" prompt="&gt; " style="Maple Input"/></Input></Group><Text-field layout="Normal" style="Normal"><Font encoding="ISO8859-1" family="Times New Roman">De plus, dans un tel cas, lorsque la condition initiale est \340 l'origine, </Font><Font style="_cstyle332">Deplot</Font><Font encoding="ISO8859-1" family="Times New Roman"> ne pourra repr\351senter correctement la solution particuli\350re dans un champ d'\351l\351ments de contact que d'une partie \351videmment de la solution g\351n\351rale.</Font></Text-field><Group><Input><Text-field layout="Normal" prompt="&gt; " style="Maple Input">DEplot(EDO,y(x),x=-6..6,[[y(0)=sqrt(10)]],y=-6..6,linecolor=navy,color=khaki,scaling=constrained,arrows=line,dirgrid=[20,20]);</Text-field></Input></Group><Group><Input><Text-field layout="Normal" prompt="&gt; " style="Maple Input"/></Input></Group><Text-field layout="Normal" style="Normal"><Font encoding="ISO8859-1" family="Times New Roman">En r\351sum\351, pour illustrer dans un champ d'\351l\351ments de contact des solutions particuli\350res lorsque la solution g\351n\351rale explicite n'est pas unique, il vaut mieux cr\351er s\351par\351ment les objets </Font><Font family="Times New Roman" style="_cstyle370">champ</Font><Font family="Times New Roman"> et <Font encoding="ISO8859-1" style="_cstyle371">trac\351s</Font><Font encoding="ISO8859-1"> des solutions particuli\350res puis superposer le tout sans utiliser </Font></Font><Font style="_cstyle348">DEplot</Font><Font family="Times New Roman">.</Font></Text-field><Text-field layout="Normal" style="Normal"/><Text-field layout="Normal" style="Normal"><Font encoding="ISO8859-1" family="Times New Roman">Dans le cas o\371 la solution g\351n\351rale explicite correspond \340 une seule solution, la macro-commande </Font><Font style="_cstyle312">DEplot</Font><Font encoding="ISO8859-1" family="Times New Roman"> permet de tracer correctement les solutions particuli\350res, que les conditions initiales soient \340 l'origine ou non.</Font></Text-field><Text-field layout="Normal" style="Normal"/><Text-field layout="Normal" style="Normal"><Font encoding="ISO8859-1" family="Times New Roman">Soit l'\351quation diff\351rentielle </Font><Equation input-equation="`y'` = -2*x-y;" style="2D Comment">NiMvJSN5J0csJiomIiIjIiIiJSJ4R0YoISIiJSJ5R0Yq</Equation><Font family="Times New Roman">.</Font></Text-field><Group><Input><Text-field layout="Normal" prompt="&gt; " style="Maple Input">EDO:=D(y)(x)=-2*x-y(x);
Sol:=dsolve(EDO);</Text-field></Input></Group><Text-field layout="Normal" style="Normal"><Font encoding="ISO8859-1" family="Times New Roman">La solution g\351n\351rale explicite de cette \351quation est donc unique.</Font></Text-field><Group><Input><Text-field layout="Normal" prompt="&gt; " style="Maple Input">Sol_generale:=subs([y(x)=y,_C1=C],Sol);</Text-field></Input></Group><Text-field layout="Normal" style="Normal"><Font encoding="ISO8859-1" family="Times New Roman">Tra\347ons, avec DEplot, la solution particuli\350re correspondant \340 la condition initiale </Font><Equation input-equation="y(1/5)=1/2" style="2D Comment">NiMvLSUieUc2IyomIiIiRigiIiYhIiIqJkYoRigiIiNGKg==</Equation><Font family="Times New Roman">.</Font></Text-field><Group><Input><Text-field layout="Normal" prompt="&gt; " style="Maple Input">Graphique:=DEplot(EDO,y(x),x=-2..2,[[y(1/5)=1/2]],y=-2..2,linecolor=navy,color=khaki,scaling=constrained,arrows=line,dirgrid=[25,25]):
Graphique;</Text-field></Input></Group><Group><Input><Text-field layout="Normal" prompt="&gt; " style="Maple Input"/></Input></Group><Text-field layout="Normal" style="Normal"><Font encoding="ISO8859-1" family="Times New Roman">Superposons dans ce graphique le trac\351 du point (1/5,1/2). Utilisons la macro-commande </Font><Font style="_cstyle372">disk</Font><Font family="Times New Roman"> de l'extension </Font><Font style="_cstyle373">plottools</Font><Font family="Times New Roman">.</Font></Text-field><Group><Input><Text-field layout="Normal" prompt="&gt; " style="Maple Input">with(plottools,disk);</Text-field></Input></Group><Group><Input><Text-field layout="Normal" prompt="&gt; " style="Maple Input">P:=disk([1/5,1/2],0.05,color=navy):
display(Graphique,P);
</Text-field></Input></Group><Group><Input><Text-field layout="Normal" prompt="&gt; " style="Maple Input"/></Input></Group><Text-field layout="Normal" style="Normal"><Font encoding="ISO8859-1" family="Times New Roman">Bien s\373r, les trac\351s de solutions particuli\350res correspondant \340 des solutions initiales \340 l'origine seront correctement rendus.</Font></Text-field><Group><Input><Text-field layout="Normal" prompt="&gt; " style="Maple Input">P1:=disk([0,-2],0.05,color=navy):
P2:=disk([0,-1],0.05,color=navy):
P3:=disk([0,0],0.05,color=navy):
P4:=disk([0,1],0.05,color=navy):
P5:=disk([0,2],0.05,color=navy):</Text-field></Input></Group><Group><Input><Text-field layout="Normal" prompt="&gt; " style="Maple Input">Graphique:=DEplot(EDO,y(x),x=-2..2,[[y(0)=-2],[y(0)=-1],[y(0)=0],[y(0)=1],[y(0)=2]],y=-2..2,linecolor=navy,color=khaki,scaling=constrained,arrows=line,dirgrid=[25,25]):</Text-field></Input></Group><Group><Input><Text-field layout="Normal" prompt="&gt; " style="Maple Input">display([Graphique,P||(1..5)]);</Text-field></Input></Group><Text-field layout="Normal" style="Normal"><Font encoding="ISO8859-1" family="Times New Roman">Mais le trac\351 manuel des solutions particuli\350res avec la macro-commande </Font><Font style="_cstyle333">plot</Font><Font encoding="ISO8859-1" family="Times New Roman"> donne des trac\351s de meilleurs qualit\351s. En effet, puisque la solution g\351n\351rale explicite est unique, on peut utiliser efficacement la macro-commande </Font><Font style="_cstyle334">plot</Font><Font family="Times New Roman">.</Font></Text-field><Group><Input><Text-field layout="Normal" prompt="&gt; " style="Maple Input">Champ:=dfieldplot(EDO,[y(x)],
x=-2..2,y=-2..2,arrows=line,dirgrid=[25,25],scaling=constrained,color=khaki):</Text-field></Input></Group><Group><Input><Text-field layout="Normal" prompt="&gt; " style="Maple Input"/></Input></Group><Text-field layout="Normal" style="Normal"><Font encoding="ISO8859-1" family="Times New Roman">Superposons au champ d'\351l\351ments de contact pr\351c\351dent, les solutions particuli\350res correspondant aux conditions initiales </Font><Equation input-equation="y(0)=C" style="2D Comment">NiMvLSUieUc2IyIiISUiQ0c=</Equation><Font family="Times New Roman"> pour C =  </Font><Equation input-equation="-2" style="2D Comment">NiMsJCIiIyEiIg==</Equation><Font family="Times New Roman">, </Font><Equation input-equation="-1" style="2D Comment">NiMsJCIiIiEiIg==</Equation><Font family="Times New Roman">, 0, 1 et 2.</Font></Text-field><Group><Input><Text-field layout="Normal" prompt="&gt; " style="Maple Input">Valeurs:=[-4,-3,-2,-1,0];</Text-field></Input></Group><Group><Input><Text-field layout="Normal" prompt="&gt; " style="Maple Input">for i from 1 to nops(Valeurs) do
 C:=Valeurs[i]; 
 Courbe||i:=plot([x,rhs(Sol_generale),x=-2..2],color=navy,thickness=2):
od:
C:='C':  # Pour rendre C libre
i:='i':  # Pour rendre i libre</Text-field></Input></Group><Group><Input><Text-field layout="Normal" prompt="&gt; " style="Maple Input">display([Courbe||(1..nops(Valeurs)),Champ,P||(1..5)],view=[-2..2,-2..2],title="dy/dx = -2x-y",titlefont=[TIMES,ROMAN,12]);</Text-field></Input></Group><Group><Input><Text-field layout="Normal" prompt="&gt; " style="Maple Input"/></Input></Group></Section><Section collapsed="true"><Title><Text-field layout="Heading 1" style="Heading 1"><Font encoding="ISO8859-1" family="Times New Roman"> R\351solution num\351rique</Font></Text-field></Title><Text-field layout="Normal" style="Normal"><Font encoding="ISO8859-1" family="Times New Roman">Soit l'\351quation diff\351rentielle </Font><Equation input-equation="dy/(dx) = cos(x*y)" style="2D Comment">NiMvKiYlI2R5RyIiIiUjZHhHISIiLSUkY29zRzYjKiYlInhHRiYlInlHRiY=</Equation><Font family="Times New Roman">.</Font></Text-field><Group><Input><Text-field layout="Normal" prompt="&gt; " style="Maple Input">EDO:=diff(y(x),x)=cos(x*y(x));</Text-field></Input></Group><Text-field layout="Normal" style="Normal"><Font family="Times New Roman">Utilisons la macro-commande </Font><Font style="_cstyle349">dsolve</Font><Font encoding="ISO8859-1" family="Times New Roman"> pour r\351soudre cette \351quation.</Font></Text-field><Group><Input><Text-field layout="Normal" prompt="&gt; " style="Maple Input">dsolve(EDO,y(x));</Text-field></Input></Group><Group><Input><Text-field layout="Normal" prompt="&gt; " style="Maple Input"/></Input></Group><Text-field layout="Normal" style="Normal"><Font encoding="ISO8859-1" family="Times New Roman">Aucun r\351sultat n'est apparu. R\351solvons de nouveau cette \351quation mais en suivant l'\351valuateur dans sa recherche d'un m\351thode de r\351solution.</Font></Text-field><Group><Input><Text-field layout="Normal" prompt="&gt; " style="Maple Input">infolevel[dsolve]:=3:</Text-field></Input></Group><Group><Input><Text-field layout="Normal" prompt="&gt; " style="Maple Input">dsolve(EDO,y(x));</Text-field></Input></Group><Group><Input><Text-field layout="Normal" prompt="&gt; " style="Maple Input"/></Input></Group><Text-field layout="Normal" style="Normal"><Font encoding="ISO8859-1" family="Times New Roman">Comme on le voit, l'\351valuateur a essay\351 plusieurs m\351thodes analytiques de r\351solution. Ces m\351thodes se sont av\351r\351es vaines. L'\351valuateur conna\356t, bien s\373r, d'autres techniques plus avanc\351es de r\351solution qui passent par des d\351velopements en s\351ries, par des transformations de Laplace. L'aide de </Font><Font style="_cstyle350">dsolve</Font><Font encoding="ISO8859-1" family="Times New Roman"> donne de l'information sur ce sujet mais, en ce qui nous concerne, nous n'allons pas \351laborer l\340-dessus.</Font></Text-field><Text-field layout="Normal" style="Normal"/><Text-field layout="Normal" style="Normal"><Font encoding="ISO8859-1" family="Times New Roman">Quoique nous n'avons pu obtenir une solution g\351n\351rale analytique, cela ne veut pas dire pour autant qu'on ne peut pas obtenir de solutions particuli\350res. En effet, visualisons les trajectoires de ces solutions particuli\350res avec </Font><Font style="_cstyle351">dfieldplot</Font><Font family="Times New Roman">.</Font></Text-field><Group><Input><Text-field layout="Normal" prompt="&gt; " style="Maple Input">Champ:=dfieldplot(EDO,[y(x)],x=0..2*Pi,y=0..4,color=orange,arrows=LINE,dirgrid=[40,40]):</Text-field></Input></Group><Group><Input><Text-field layout="Normal" prompt="&gt; " style="Maple Input">Champ;</Text-field></Input></Group><Group><Input><Text-field layout="Normal" prompt="&gt; " style="Maple Input"/></Input></Group><Text-field layout="Normal" style="Normal"><Font encoding="ISO8859-1" family="Times New Roman">L'\351valuateur a la capacit\351 d'employer certaines m\351thodes num\351riques de r\351solution pouvant donner de bonnes approximations des solutions avec conditions initiales. La feuille Maple intitul\351e \253 \311quations diff. et m\351thodes num\351riques \273, que vous pouvez retrouver sur mon site internet, \351labore sur quelques m\351thodes num\351riques \351l\351mentaires. Sans donner de d\351tails ici, voyons comment, avec </Font><Font style="_cstyle352">dsolve</Font><Font encoding="ISO8859-1" family="Times New Roman">, obtenir num\351riquement une courbe-solution particuli\350re.</Font></Text-field><Text-field layout="Normal" style="Normal"/><Text-field layout="Normal" style="Normal"><Font encoding="ISO8859-1" family="Times New Roman">En pr\351cisant, en option, l'attribut \253 </Font><Font style="_cstyle353">numeric</Font><Font encoding="ISO8859-1" family="Times New Roman"> \273, le r\351sultat sera une proc\351dure (une fonction) de calcul pour </Font><Font family="Times New Roman" style="_cstyle354">y</Font><Font encoding="ISO8859-1" family="Times New Roman"> dans la courbe-solution de l'\351quation diff\351rentielle correspondant \340 la valeur de </Font><Font family="Times New Roman" style="_cstyle374">x</Font><Font family="Times New Roman">. Donnons le nom <Font style="_cstyle375">Points_particuliers</Font><Font encoding="ISO8859-1"> \340 cette proc\351dure.</Font></Font></Text-field><Text-field layout="Normal" style="Normal"/><Group><Input><Text-field layout="Normal" prompt="&gt; " style="Maple Input">infolevel[dsolve]:=0;</Text-field></Input></Group><Group><Input><Text-field layout="Normal" prompt="&gt; " style="Maple Input">Points_particuliers:=dsolve({EDO,y(1)=2},y(x),numeric);</Text-field></Input></Group><Group><Input><Text-field layout="Normal" prompt="&gt; " style="Maple Input"/></Input></Group><Text-field layout="Normal" style="Normal"><Font encoding="ISO8859-1" family="Times New Roman">Ainsi, Points_particuliers(3) donnera comme r\351sultat le point dont les coordonn\351es sont (3,y(3)) de la solution particuli\350re isol\351e par la condition initiale </Font><Equation input-equation="y(1)=2" style="2D Comment">NiMvLSUieUc2IyIiIiIiIw==</Equation><Font family="Times New Roman">. </Font></Text-field><Group><Input><Text-field layout="Normal" prompt="&gt; " style="Maple Input">Points_particuliers(3);</Text-field></Input></Group><Group><Input><Text-field layout="Normal" prompt="&gt; " style="Maple Input"/></Input></Group><Text-field layout="Normal" style="Normal"><Font encoding="ISO8859-1" family="Times New Roman">Reste donc \340 g\351n\351rer un certain nombre de points pour le trac\351 de cette solution particuli\350re qui seront superpos\351s dans le champ des \351l\351ments de contact de cette \351quation diff\351rentielle. Au lieu de le faire manuellement, la macro-commande </Font><Font style="_cstyle355">odeplot</Font><Font family="Times New Roman"> de l'extension </Font><Font style="_cstyle356">plots</Font><Font family="Times New Roman"> est plus efficace dans ce cas.</Font></Text-field><Group><Input><Text-field layout="Normal" prompt="&gt; " style="Maple Input">with(plots,odeplot);</Text-field></Input></Group><Group><Input><Text-field layout="Normal" prompt="&gt; " style="Maple Input">Sol_Particuliere:=odeplot(Points_particuliers,[x,y(x)],0..2*Pi,color=navy,thickness=2):</Text-field></Input></Group><Group><Input><Text-field layout="Normal" prompt="&gt; " style="Maple Input">display([Champ,Sol_Particuliere]);</Text-field></Input></Group><Group><Input><Text-field layout="Normal" prompt="&gt; " style="Maple Input"/></Input></Group></Section><Text-field layout="Normal" style="Normal"/><Text-field/></Worksheet>