Goal:
  
  __p1 : Prop
  __x2 : Z
  __x1 : Z
  __wit := [] : list ZMicromega.ZArithProof
  __varmap := VarMap.Branch (VarMap.Elt __x1) __x2 (VarMap.Elt __x2)
           : VarMap.t Z
  __ff := Tauto.IMPL
            (Tauto.A Tauto.isProp
               {|
                 RingMicromega.Flhs := EnvRing.PEX 2;
                 RingMicromega.Fop := RingMicromega.OpLe;
                 RingMicromega.Frhs :=
                   EnvRing.PEadd (EnvRing.PEc 0)
                     (EnvRing.PEsub (EnvRing.PEX 3) (EnvRing.PEX 3))
               |} tt) None
            (Tauto.IMPL
               (Tauto.A Tauto.isProp
                  {|
                    RingMicromega.Flhs := EnvRing.PEX 2;
                    RingMicromega.Fop := RingMicromega.OpGt;
                    RingMicromega.Frhs := EnvRing.PEc 0
                  |} tt) None (Tauto.X Tauto.isProp __p1))
       : Tauto.BFormula (RingMicromega.Formula Z) Tauto.isProp
  ============================
   (__x1 <= 0 + (__x2 - __x2) -> __x1 > 0 -> __p1)


DEBUG:Going to execute:
exact
(ZMicromega.ZTautoChecker_sound __ff __wit
   (eq_refl <: ZMicromega.ZTautoChecker __ff __wit = true)
   (VarMap.find 0 __varmap))