fact: Definition subvs_mul (u v : subvs_of A) := Subvs (subv_trans (memv_mul (subvsP u) (subvsP v)) (asubv _)).
imports: HB(structures) mathcomp(ssreflect ssrfun ssrbool eqtype ssrnat seq path) mathcomp(choice fintype div tuple finfun bigop ssralg) mathcomp(finalg zmodp matrix vector poly)