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rules for Sign[_]^n

Hi, MathGroup,

dealing with Sign, it would be useful, if Mathematica

{(Sign[_])^(y_?EvenQ):>1, (Sign[x_])^(y_?OddQ):>Sign[x]}

How can I teach Mathematica this rule (in Init.m), such that it
automaticly applies it in Simplify, Expand and the like
whenever applicable?

kind regards

Dipl.-Math. Adalbert Hanszen

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