fact: Definition intR m : R := match m with Posz n => n%:R | Negz n => - n.+1%:R end.
imports: mathcomp(ssreflect ssrfun ssrbool eqtype ssrnat div order) mathcomp(ssralg ssrnum ssrint rat intdiv) Coq(Morphisms Setoid) fourcolor(real realsyntax)