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Pattern Matching Question


I'm new to pattern matching, and am stuck on a seemingly simple probem:

If I want to transform a pattern like

(I)  Power[x,_]   i.e. x^_

but NOT

(II) Power[x,Plus[_,_]]   i.e. x^(_+_)

How would I go about making that rule?

x^_ -> NewForm

Applies the rule to (II), which I don't want.

Thank you for your help :)




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