Name: Thibaut Cousin (email_not_shown)
Date: 06/20/02-03:41:45 PM Z


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Hello,

  I'm using version 4.1.1 on Mathematica 4.0.
  The problem arises when I have the following expression:

x=LC[a,b,c,d]FourVector[k1,a]FourVector[k2,b]FourVector[k3,c]FourVector[k4,d]

  I have previously given the value of all possible scalar products. I want
Feyncalc to expand x using these scalar products.
  I've tried to use every possible Feyncalc command, without success. On the
other hand, if I ask it to compute Calc[x*x], it works! I've checked by hand,
the result is correct, but then I loose the sign of x.
  Is there a way to make Feyncalc expand a single LC contraction? Is it a bug?
  Regards,

- --
Thibaut Cousin
email : cousin@in2p3.fr
web : http://clrwww.in2p3.fr
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