**Next message:**Vladyslav Shtabovenko: "Re: Antisymmetric tensor contracted w 4vectors"**Previous message:**Vladyslav Shtabovenko: "Re: Problems with Tarcer's mx files"**Maybe in reply to:**sumit: "Two index lorentz antisymmetric tensor"**Messages sorted by:**[ date ] [ thread ] [ subject ] [ author ]**Mail actions:**[ respond to this message ] [ mail a new topic ]

This is what TensorFunction is for

TH[x_, y_] := TensorFunction[{Theta, "A"}, x, y]

TH[a, b] + TH[b, a]

gives 0. Same for

Contract[TH[a, b] MT[a, b]]

or

Contract[TH[a, b] FV[p, a] FV[p, b]]

For

Contract[TH[a, b] FV[p, a] FV[q, b] - TH[a, b] FV[p, b] FV[q, a]]

you get 2 Theta[Momentum[p], Momentum[q]]

The only inconvenience is that a contraction of an antisymmetric tensor

with a symmetric one doesn't vanish automatically.

Cheers,

Vladyslav

*> Dear All
*

*>
*

*> I am doing one scattering calculation by trace method. I need to define two index antisymmetric Lorentz tensor(\theta_{\mu \nu}. where \mu,\nu..1..4) in my code.
*

*>
*

*> I am not able to figure out how one can do it in feyncalc...Please help!!
*

*>
*

*> thanks
*

**Next message:**Vladyslav Shtabovenko: "Re: Antisymmetric tensor contracted w 4vectors"**Previous message:**Vladyslav Shtabovenko: "Re: Problems with Tarcer's mx files"**Maybe in reply to:**sumit: "Two index lorentz antisymmetric tensor"**Messages sorted by:**[ date ] [ thread ] [ subject ] [ author ]**Mail actions:**[ respond to this message ] [ mail a new topic ]

*
This archive was generated by hypermail 2b29
: 03/19/18-07:00:02 PM Z CET
*