fact: Definition row_free_injr m n p A : row_free A -> injective (mulmxr A) := @row_free_inj m n p A.
imports: HB(structures) mathcomp(ssreflect ssrbool ssrfun eqtype ssrnat seq choice) mathcomp(fintype finfun bigop finset fingroup perm order) mathcomp(div prime binomial ssralg finalg zmodp matrix)