Codiff - codifferential operator

Codiff[expr]
allows one to calculate codifferential on an expression that is p-form
  • expr - any expression.
  • The codifferential is the operator : p -> p-1 where p is p-form and p-1 is (p-1)-form. The codifferential is defined as follows: If is a p-form then []=(-1)dim2+dim n+1*d[*[]]