Name: Rolf Mertig Date: 12/09/04-12:25:45 AM Z

Dear Jaime,

Dr. Jaime Hernandez Sanchez;icbi wrote:

>Dear Mertig:
>
>i have several problems with Feyncal.
>
>I have mathematica 5 on mac-g5`s plataform.
>
>Firts, when i run FeynCalc, It gives the following result
>
>DumpGet::bgbf: File \
>/Library/Mathematica/Applications/HighEnergyPhysics/Tarcer/tarcer25.mx cannot \
>be loaded, it is corrupted or is written on a different machine
>
>
Please evaluate in an emtpy notebook (without loading FeynCalc):

SetDirectory[“/Library/Mathematica/Applications/HighEnergyPhysics/Tarcer/”];
NotebookOpen[“/Library/Mathematica/Applications/HighEnergyPhysics/Tarcer/Tarcer.nb”];

Then evaluate the whole notebook.
This will produce a new “tarcer25.mx” (or similar, depending on the
setting of $RankLimit )

>I have tried to replace the file tarcer25.mx by tarcer23.mac.mx from web page
>mertig.com, however
>
>it gives other mistake.
>
>Second
>
>I have tried to run some simple programs and to verify that they are correct, for
>example
>
>a trivial exercise
>
>FullSimplify[TR[(GS[k] + m).(GA[mu]).(GS[p] - m).GA[nu]]]
>
>it gives a correct result
>
>but
>
>TR[(GS[p1] + m).(GA[mu].GS[k].GA[ nu] + 2 GA[mu] FV[p2, nu]).(GS[p2] + m).(GA[nu].GS[k].GA[mu] +
>2 GA[mu] FV[p2, nu])]
>
>mathamatica does not give a correct result.
>
>
This is a bug (probably introduced when fixing other bugs last year).
 It should only occur if you call TR on unsimplified noncommutative
expressions directly.
A quick workaround is to use “tr” instead of TR, with

tr = TR[Calc[#]] &;

I am planning to fix FeynCalc - bugs (and some error messages showing up
when loading FeynCalc in Mathematica 5.1 ) together
with Frederik before Christmas, but I cannot fix them right now.

Sorry about the trouble.

Saludos,

Rolf Mertig

GluonVision GmbH
Berlin

>
>I need your help.
>
>
>Regards
>
>
>Jaime
>
>
>–
>Universidad Autonoma del Estado de Hidalgo
>Centro de Investigacion Avanzada en Ingenieria Industrial
>Licenciatura en Fisica y Tecnologia Avanzada
>Pachuca, Hidalgo. C. P. 42090
>Tel y Fax: (771)7172000 ext. 6733
>
>