proposition: Lemma fdistD1_0 a : X a = 0 -> fdistD1 Xb1 a = 0.
proof: Proof. by move=> Xa0; rewrite fdistD1E Xa0 mul0r; case: ifP. 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