proposition: Lemma cycle_typeV s : cycle_type s^-1 = cycle_type s.
proof: Proof. by apply val_inj; rewrite /= porbitsV. 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