proposition: Lemma dom_by_fdist_sndN a b : P (a, b) != 0 -> fdist_snd b != 0.
proof: Proof. by apply: contra => /eqP /dom_by_fdist_snd ->. 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