Name: Markus (email_not_shown)
Date: 05/02/07-05:48:52 PM Z


after using SetMandelstam[..], the Mandelstam variables are then plugged in
on every possible occasion.
However, I only want to use them at a particular point in my Mathematica program,
and after this, I want to switch back to unevaluated momenta.

So, how do I prohibit the automatic replacement of the momentum products
by Mandelstam-expressions after using SetMandelstam for one time?

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