fact: Definition simplR := (add0R, addR0, subR0, mul0R, mulR0, mul1R, mulR1).
imports: mathcomp(all_ssreflect ssralg ssrnum) Reals mathcomp(Rstruct) ssrR realType_ext Reals_ext ssr_ext ssralg_ext logb fdist entropy convex ln_facts jensen num_occ