Name: Simone Arnold (email_not_shown)
Date: 07/25/07-09:58:16 AM Z


I have defined some Tensors L_{mu nu} and W^{mu nu} for example like

Lmunu = FV[l, \[Rho]]*FV[k, \[Sigma]] + FV[l, \[Sigma]]*FV[k, \[Rho]]
Wmunu = FV[pa, \[Mu]]*FV[pa, \[Nu]]

To get the cross section I used Contract[Lmunu*Wmunu] which worked fine. The result now includes some scalar products like pa*k. Now I would like to replace this scalar products by some number. How do I do that? I tried to define e.g.
before the Contract[...], but this did not work. Did I forget anything, or is there any other way?

Thank you, Simone

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