Name: Andreas Ross Date: 06/21/05-06:27:49 PM Z

Thank you very much!!!
Now that I understood that the $MU[1]s are just dummy indeces I also found another solution that gets rid of them:

ToExpression[StringReplace[ToString[Calc[M] // StandardForm], “$MU[1]” -> “a”]]

Again, thanks for your quick reply!!!

Andreas