Name: Vladyslav Shtabovenko (email_not_shown)
Date: 05/04/17-01:09:54 PM Z


thanks for reporting this.

This is a bug related to the internal caching of DiracTrace: once the
calculated traces are cached with a particular value of $LeviCivtaSign,
setting it to something else does not change the cached results.

Should be now fixed in the stable and in the the development versions.


Please reinstall the stable version via the automatic installer.


Am 03.05.2017 um 16:22 schrieb JamesG:
> Hi,
> Trying to reset the LeviCivita sign conventions appears to me to have no effect when using the definitions above. For example I find that the input
> Tr[[GA[a, b, c, d, 5]]
> $LeviCivitaSign = 1;
> Tr[GA[a, b, c, d, 5]]
> gives
> -4 I Eps[LorentzIndex[a], LorentzIndex[b], LorentzIndex[c],
> LorentzIndex[d]]
> independent of whatever else I set $LeviCivitaSign to.
> Is there some other way to fix the conventions in the latest version of Feyncalc (9.2); or is this affected by, say, a more recent version of Mathematica (I am currently using 10.1)?
> James

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