Error, recursive assignment - Maple Help

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Error, recursive assignment

 Description The recursive assignment message occurs when you try to define a variable or structure in terms of itself. For instance, if you define a Matrix and try to assign it to M, and simultaneously enter the name M as an entry in that Matrix, Maple returns an error.

Examples

 > $x:=f\mathit{}\left(x\right);$
 > $M\phantom{\rule[-0.0ex]{0.5em}{0.0ex}}:=\phantom{\rule[-0.0ex]{0.5em}{0.0ex}}\mathrm{Matrix}(3,4,\mathrm{fill}=M);$