Name: Markus Date: 05/02/07-05:48:52 PM Z
Hello,
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?