you don't have to convert things to Strings:
Calc[M] /. $MU -> a
Am Dienstag, 21. Juni 2005 18:27 schrieben Sie:
> Thank you very much!!!
> Now that I understood that the $MUs are just dummy indeces I also found
> another solution that gets rid of them:
> ToExpression[StringReplace[ToString[Calc[M] // StandardForm], "$MU" ->
> Again, thanks for your quick reply!!!
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