proposition: Lemma can2_scalable f' : cancel f f' -> cancel f' f -> scalable f'.
proof: Proof. by move=> fK f'K a x; apply: (canLR fK); rewrite linearZ_LR f'K. Qed.
imports: HB(structures) mathcomp(ssreflect ssrfun ssrbool eqtype ssrnat div seq) mathcomp(choice fintype finfun bigop prime binomial)