proposition: Lemma equivf_r x : \n_x * \d_(repr (\pi_type x)) = \d_x * \n_(repr (\pi_type x)).
proof: Proof. by apply/eqP; rewrite -equivf_def reprK. Qed.
imports: HB(structures) mathcomp(ssreflect ssrfun ssrbool eqtype ssrnat div seq) mathcomp(ssrAC choice tuple bigop ssralg poly polydiv) mathcomp(generic_quotient)