fact: Definition int_of_Z (n : Z) : int := match n with | Z0 => Posz 0 | Zpos p => Posz (Pos.to_nat p) | Zneg p => Negz (Pos.to_nat p).-1 end.
imports: Coq(ZArith) HB(structures) mathcomp(ssreflect ssrfun ssrbool eqtype ssrnat seq path) mathcomp(div choice fintype tuple finfun bigop finset prime) mathcomp(order binomial ssralg countalg ssrnum ssrint) mathcomp(zify_ssreflect)