fact: Definition s_of_pq {R : realType} (p q : {prob R}) : {prob R} := locked ((Prob.p p).~ * (Prob.p q).~).~%:pr.
imports: mathcomp(all_ssreflect ssralg ssrnum) mathcomp(reals normedtype) mathcomp(mathcomp_extra boolp) mathcomp(lra ring Rstruct)