proposition: Lemma fgscaleDr c g1 g2 : c *:g (g1 + g2) = c *:g g1 + c *:g g2.
proof: Proof. by apply/malgP=> k; rewrite !(mcoeffD, fgscaleE) mulrDr. Qed.
imports: HB(structures) mathcomp(ssreflect ssrfun ssrbool eqtype ssrnat) mathcomp(seq path choice finset fintype finfun) mathcomp(tuple bigop ssralg ssrint ssrnum) xfinmap