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operator for forming an expression sequence

 Calling Sequence expr $i = m..n expr$ n $m..n Parameters  expr - expression i - unevaluated name m, n - expressions Description  • You can use the$ operator to return the expression sequence produced by substituting for i in expr the values m,m+1,...,n (or up to the last value not exceeding n).
 • If m>n then the NULL expression sequence is returned.
 • A call to $in the form:$ m..n will have the same effect as the call: i $i = m..n.  • A call to$ in the form:  expr $n will have the same effect as the call: expr$ i = 1..n  (assuming that expr does not contain i).
 • Note:  It is recommended (and often necessary) that both 'expr' and 'i' be enclosed in single quotes to prevent premature evaluation. (If i had been assigned a value, the i in the expression would be evaluated to its value, and so could not be used as a counting variable.) The most common use is 'expr' $'i' = m..n.  • For information on the end-of-parameters marker , see Parameter Declarations. Thread Safety  • The$ operator is thread-safe as of Maple 15.

Examples

 > $\mathrm{}\left(2..5\right)$
 ${2}{,}{3}{,}{4}{,}{5}$ (1)
 > ${i}^{2}$\left(i=\frac{2}{3}..\frac{8}{3}\right)$  $\frac{{4}}{{9}}{,}\frac{{25}}{{9}}{,}\frac{{64}}{{9}}$ (2)  > ${a}_{i}$\left(i=1..3\right)$
 ${{a}}_{{1}}{,}{{a}}_{{2}}{,}{{a}}_{{3}}$ (3)
 > $x\$4$
 ${x}{,}{x}{,}{x}{,}{x}$ (4)