fact: Definition int_abs `{ia : IntAbs} (x : Z) : N := match int_abs_sig x with | inl (n;_) => n | inr (n;_) => n end.
imports: HoTT.Classes.interfaces.abstract_algebra HoTT.Classes.interfaces.orders HoTT.Classes.interfaces.naturals HoTT.Classes.theory.rings 