proposition: Lemma card'E (T : finType) (P : pred T) : card' (@Finite.enum _) P = #|P|.
proof: Proof. by rewrite cardE; rewrite /card' /size_op/= size_seqE. Qed.
imports: HB(structures) mathcomp.ssreflect.ssreflect mathcomp(ssrfun ssrbool eqtype ssrnat seq choice fintype tuple) mathcomp(bigop binomial finset finfun zmodp ssralg countalg finalg poly polydiv) mathcomp(perm fingroup) CoqEAL(hrel pos param refinements binnat boolF2 seqpoly poly_op trivial_seq poly_div boolF2)