proposition: Fact lez_total m n : lez m n || lez n m.
proof: Proof. by move: m n => [] m [] n //=; apply: leq_total. Qed.
imports: HB(structures) mathcomp(ssreflect ssrfun ssrbool eqtype ssrnat choice seq) mathcomp(fintype finfun bigop order ssralg countalg ssrnum) mathcomp(poly)