FourVector[p, ] is the four-dimensional vector p with Lorentz index
. A vector with space-time Dimension D is obtained by supplying the option Dimension -> D.
![[Graphics:Images/index_gr_3.gif]](Images/index_gr_3.gif)
![[Graphics:Images/index_gr_5.gif]](Images/index_gr_5.gif)
![[Graphics:Images/index_gr_7.gif]](Images/index_gr_7.gif)
![[Graphics:Images/index_gr_9.gif]](Images/index_gr_9.gif)
![[Graphics:Images/index_gr_11.gif]](Images/index_gr_11.gif)
There is no special function to expand momenta in FourVector. Since FourVector is turned into Pair internally ExpandScalarProduct may be used.
![[Graphics:Images/index_gr_13.gif]](Images/index_gr_13.gif)
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