'Return the elements in permutation, P, for which P[i] != i.
Examples
>>> from sympy.combinatorics import Permutation
>>> p = Permutation([[3, 2], [0, 1], [4]])
>>> p.array_form
[1, 0, 3, 2, 4]
>>> p.support()
[0, 1, 2, 3]'

def support(self):

    a = self.array_form
    return [i for (i, e) in enumerate(a) if (a[i] != i)]
