Goal:
  
  __x5 : Z
  __x4 : Z
  __x3 : Z
  __x2 : Z
  __x1 : Z
  __wit := [ZMicromega.RatProof
              (RingMicromega.PsatzAdd
                 (RingMicromega.PsatzMulC (EnvRing.Pc (-1))
                    (RingMicromega.PsatzIn Z 1)) (RingMicromega.PsatzIn Z 0))
              ZMicromega.DoneProof] : list ZMicromega.ZArithProof
  __varmap := VarMap.Branch
                (VarMap.Branch (VarMap.Elt __x4) __x2 VarMap.Empty) __x1
                (VarMap.Branch (VarMap.Elt __x5) __x3 VarMap.Empty)
           : VarMap.t Z
  __ff := Tauto.IMPL
            (Tauto.A Tauto.isProp
               {|
                 RingMicromega.Flhs := EnvRing.PEX 2;
                 RingMicromega.Fop := RingMicromega.OpEq;
                 RingMicromega.Frhs :=
                   EnvRing.PEadd
                     (EnvRing.PEadd (EnvRing.PEX 3) (EnvRing.PEX 4))
                     (EnvRing.PEX 5)
               |} tt) None
            (Tauto.A Tauto.isProp
               {|
                 RingMicromega.Flhs :=
                   EnvRing.PEadd (EnvRing.PEX 1) (EnvRing.PEX 2);
                 RingMicromega.Fop := RingMicromega.OpEq;
                 RingMicromega.Frhs :=
                   EnvRing.PEadd
                     (EnvRing.PEadd
                        (EnvRing.PEadd (EnvRing.PEX 1) (EnvRing.PEX 3))
                        (EnvRing.PEX 4)) (EnvRing.PEX 5)
               |} tt) : Tauto.BFormula (RingMicromega.Formula Z) Tauto.isProp
  ============================
   (__x2 = __x3 + __x4 + __x5 -> __x1 + __x2 = __x1 + __x3 + __x4 + __x5)


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