Dimension
is an option of several functions and denotes the number of space-time dimensions. Possible settings are: 4
, n
, d
, D
, … , the variable does not matter, but it should have head Symbol.
Options[ScalarProduct]
= ScalarProduct[m, n, Dimension -> d] ex
// StandardForm
ex
(*Pair[Momentum[m, d], Momentum[n, d]]*)