fact: Variables (zero : F) (add : F -> F -> F) (opp : F -> F) (sub : F -> F -> F).
imports: elpi(elpi) Coq(QArith) Coq.micromega(OrderedRing RingMicromega) mathcomp(all_ssreflect ssralg ssrnum ssrint) mathcomp.zify(ssrZ zify)