fixedPoints w
A permutation $p$ has a fixed point at $i$ if $p(i) = i$. fixedPoints computes all of the fixed points of a permutation.
i1 : p = permutation {2,1,3,5,4} o1 = Permutation{2, 1, 3, 5, 4} o1 : Permutation
i2 : fixedPoints p o2 = {3} o2 : List
The object fixedPoints is a method function.