proposition: Lemma classCTP s : (cycle_type s == ct) = (s \in classCT).
proof: Proof. Proof using. by rewrite eq_sym /classCT classes_of_permP permCTP. Qed.
imports: mathcomp.ssreflect.ssreflect mathcomp(ssrfun ssrbool eqtype ssrnat seq choice fintype) mathcomp(tuple finfun finset path bigop) mathcomp(fingroup perm action) mathcomp(ssralg matrix mxalgebra algC classfun) partition tools sorted permcomp fibered_set cycles