Hi,
it is not a bug. The change was announced on the news page
(November 13-11, 2014)
https://github.com/FeynCalc/feyncalc/wiki/News
The bar signifies that the momentum is 4 dimensional,
a D-dimensional momentum has no bar and a D-4 dimensional momentum
has a hat.
Cheers,
Vladyslav
Am 21.04.2015 um 14:54 schrieb 陆宇:
> In FeynCalc 9.0.0.,
> Momentum[p] returns something like "\bar{p}".
> It can also be verified by TBox[Momentum[p]].
>
> However, Momentum[p,x] won't behave like this.
>
> Is this a bug or there are some profound considerations?
>
>
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