26 int eps(
unsigned int i,
unsigned int j);
31 int eps(
unsigned int i,
unsigned int j,
unsigned int k);
36 int eps(
unsigned int i,
unsigned int j,
unsigned int k,
unsigned int l);
int eps(unsigned int i, unsigned int j)
2D version
Utility functions to return the permutation pseudo tensor in 2D, 3D or 4D.