proposition: Lemma big_enum (I : finType) (A : {pred I}) F : \big[op/x]_(i <- enum A) F i = \big[op/x]_(i in A) F i.
proof: Proof. by rewrite big_enum_cond big_andbC. Qed.
imports: HB(structures) mathcomp(ssreflect ssrbool ssrfun eqtype ssrnat seq path) mathcomp(div fintype tuple finfun)