fact: Definition Zeval_op2 (k: Tauto.kind) : Op2 -> Z -> Z -> Tauto.rtyp k:= if k as k0 return (Op2 -> Z -> Z -> Tauto.rtyp k0) then Zeval_pop2 else Zeval_bop2.
imports: List Bool OrderedRing RingMicromega ZCoeff Refl ZArith_base ZArithRing Ztac EnvRing