proposition: Lemma prob_ge0 (p : prob R) : (0 <= (p : R))%R.
proof: Proof. by case: p => p /= /andP []. Qed.
imports: mathcomp(all_ssreflect ssralg ssrnum) mathcomp(reals normedtype) mathcomp(mathcomp_extra boolp) mathcomp(lra ring Rstruct)