proposition: Lemma mnm_sumE (I : Type) i (r : seq I) P F : (\big[+%MM/0%MM]_(x <- r | P x) (F x)) i = (\sum_(x <- r | P x) (F x i))%N.
proof: Proof. by apply/(big_morph (fun m => m i)) => [x y|]; rewrite mnmE. Qed.
imports: HB(structures) mathcomp(ssreflect ssrfun ssrbool eqtype ssrnat seq path) mathcomp(choice fintype tuple finfun bigop finset binomial) mathcomp(order fingroup perm ssralg zmodp poly ssrint) mathcomp(matrix vector) mathcomp(bigenough) ssrcomplements freeg