proposition: Lemma led_divl a b c : a <= b -> a / c <= b / c.
proof: Proof. rewrite -mul_div_equiv; exact/le_trans/div_mul_le. Qed.
imports: HB(structures) mathcomp(ssreflect ssrfun ssrbool eqtype choice order) mathcomp(fintype ssrnat bigop ssralg boolp classical_sets) dioid complete_lattice