invalid arrow procedure - Maple Help

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Error, invalid arrow procedure

 Description This is a 2-D math parser error. It occurs when the expression on the right-hand side of a functional operator is invalid. For more information, see Functional Operators.

Examples

 > $x\to @$
 

This error occurred because the @ on the right-hand side of the functional operator is not a valid expression.

Solution:

To fix this error, use a valid expression for the result of the procedure instead.

 > $x\to {x}^{2}$
 ${x}{→}{{x}}^{{2}}$ (2.1)