fact: Definition lfun_comp_ringMixin := GRing.Zmodule_isRing.Build 'End(vT) comp_lfunA comp_lfun1l comp_lfun1r comp_lfunDl comp_lfunDr lfun1_neq0.
imports: HB(structures) mathcomp(ssreflect ssrfun ssrbool eqtype ssrnat seq choice) mathcomp(fintype bigop finfun tuple) mathcomp(ssralg matrix mxalgebra zmodp)