fact: Definition is_fdist (f : A -> R) : Prop := (forall a, 0 <= f a) /\ (\sum_(a in A) f a = 1).
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