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Redefine Power


hi,
i want to redefine the Power function for matrices like that:
Power[A_?MatrixQ,n_]:=mppower[A,n];
If n is a number, then it should execute the function mppower[], elseif
Head[n]=symbol, it should return the matrix with exp n as symbol
without execution. How can I prevent the recursion of the Power-Function?
Thanks.


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