proposition: Lemma trmx_inj m n : injective (@trmx m n).
proof: Proof. exact: can_inj (@trmxK m n). Qed.
imports: HB(structures) mathcomp(ssreflect ssrbool ssrfun eqtype ssrnat seq choice) mathcomp(fintype finfun bigop finset fingroup perm order) mathcomp(div prime binomial ssralg countalg finalg zmodp)