proposition: Lemma ge0 (d : t) a : 0 <= d a.
proof: Proof. by case: d => ? /= /andP[/forallP ]. Qed.
imports: mathcomp(all_ssreflect ssralg fingroup perm matrix) mathcomp(all_algebra vector reals normedtype) mathcomp(mathcomp_extra boolp) mathcomp(Rstruct) ssrR logb realType_ext ssr_ext ssralg_ext bigop_ext