proposition: Lemma eqlfun_inP V f g : reflect {in V, f =1 g} (V <= lker (f - g))%VS.
proof: Proof. by apply: (iffP subvP) => E x /E/eqlfunP. Qed.
imports: HB(structures) mathcomp(ssreflect ssrfun ssrbool eqtype ssrnat seq choice) mathcomp(fintype bigop finfun tuple) mathcomp(ssralg matrix mxalgebra zmodp)