pub fn orbitals(degree: usize, gens: &[Perm]) -> Vec<Vec<(usize, usize)>>Expand description
The orbitals — the orbits of the group on ORDERED PAIRS (i, j) under the action
g·(i,j) = (g[i], g[j]). The diagonal {(i,i)} is always one orbital; for a transitive group the
non-diagonal orbitals are its “relation classes” (its association scheme). The count is the group’s
rank. One level finer than the point-orbits (orbits).