epsilon[i,j,k] - Predefined permutation tensor
Synopsis:
Examples:
> epsilon[1,1,1];
0
> epsilon[1,2,3];
1
> epsilon[1,3,2];
-1
> epsilon[1,j,k] &t a[j] &t b[k];
a[2] b[3] - a[3] b[2]
> for i from 1 to 3 do epsilon[i,j,k] &t a[j] &t b[k] od; i:='i':
a[2] b[3] - a[3] b[2]
- a[1] b[3] + a[3] b[1]
a[1] b[2] - a[2] b[1]