proposition: Lemma mmapC c : mmap c%:MP = f c.
proof: Proof. have [->|nz_c] := eqVneq c 0; first by rewrite mmap0 raddf0. rewrite /mmap msuppC (negbTE nz_c) big_seq1 mmap11 mulr1. by rewrite mcoeffC eqxx mulr1. 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