FeynCalc manual (development version)

EpsContract

EpsContract[exp] handles contractions of two Levi-Civita tensors. It is also an option of Contract and other functions that specifies whether such contractions should be done or not.

See also

Overview, Eps, Contract.

Examples

LCD[\[Mu], \[Nu], \[Rho], \[Sigma]] 
 
EpsContract[% %] // Factor2

$$\overset{\text{}}{\epsilon }^{\mu \nu \rho \sigma }$$

$$(1-D) (2-D) (3-D) D$$

Contract[LCD[\[Mu], \[Nu], \[Rho], \[Sigma]]^2] // Factor2

$$(1-D) (2-D) (3-D) D$$

Contract[LCD[\[Mu], \[Nu], \[Rho], \[Sigma]]^2, EpsContract -> False]

$$\left(\overset{\text{}}{\epsilon }^{\mu \nu \rho \sigma }\right)^2$$