proposition: Lemma big_seq1 (I : Type) (i : I) (F : I -> X) : \big[*%M/1]_(j <- [:: i]) F j ≡ F i.
proof: Proof. by rewrite big_cons big_nil monU. Qed.
imports: HB(structures) Coq(RelationClasses Morphisms Relation_Definitions) mathcomp(all_ssreflect)