proposition: Lemma classCT_inj : injective classCT.
proof: Proof. Proof using. rewrite /classCT => t1 t2 /class_eqP. by rewrite -classCTP permCTP => /eqP <-. 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