Pair

Description

Pair[x, y] is the head of a special pairing used in the internal representation: x and y may have heads LorentzIndex or Momentum. If both x and y have head LorentzIndex, the metric tensor is understood. If x and y have head Momentum, a scalar product is meant. If one of x and y has head LorentzIndex and the other Momentum, a Lorentz vector [Graphics:Images/index_gr_1.gif] is understood.

See also: FourVector, FV, FVD, MetricTensor, MT, MTD, ScalarProduct, SP, SPD.

Examples

This represents a four-dimensional metric tensor.

[Graphics:Images/index_gr_2.gif]
[Graphics:Images/index_gr_3.gif]

This is a D-dimensional metric tensor.

[Graphics:Images/index_gr_4.gif]
[Graphics:Images/index_gr_5.gif]
[Graphics:Images/index_gr_6.gif]
[Graphics:Images/index_gr_7.gif]
[Graphics:Images/index_gr_8.gif]
[Graphics:Images/index_gr_9.gif]
[Graphics:Images/index_gr_10.gif]
[Graphics:Images/index_gr_11.gif]
[Graphics:Images/index_gr_12.gif]
[Graphics:Images/index_gr_13.gif]
[Graphics:Images/index_gr_14.gif]
[Graphics:Images/index_gr_15.gif]
[Graphics:Images/index_gr_16.gif]
[Graphics:Images/index_gr_17.gif]
[Graphics:Images/index_gr_18.gif]
[Graphics:Images/index_gr_19.gif]
[Graphics:Images/index_gr_20.gif]
[Graphics:Images/index_gr_21.gif]
[Graphics:Images/index_gr_22.gif]
[Graphics:Images/index_gr_23.gif]


The FeynCalc Book   previousOPESumSimplify   nextPartialD

Converted from the Mathematica notebook Pair.nb