proposition: Lemma fgscale1r D: 1 *:g D = D.
proof: Proof. by apply/malgP=> k; rewrite !fgscaleE mul1r. Qed.
imports: HB(structures) mathcomp(ssreflect ssrfun ssrbool eqtype ssrnat) mathcomp(seq path choice finset fintype finfun) mathcomp(tuple bigop ssralg ssrint ssrnum) xfinmap