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?
This archive was generated by hypermail 2b29 : 09/22/17-08:00:01 AM Z CEST