Goal:
  
  G : t
  HI : invariants
  z : Z
  z0 : Z
  H : 0 <= z
  H0 : 0 <= z0
  z1 : Z
  H1 : z < z0 /\ z1 = z0 \/ z0 <= z /\ z1 = z
  ============================
   (z1 = z1)


DEBUG:Going to execute:
idtac
DEBUG LTAC Evaluated term: false
DEBUG LTAC Evaluated term: false
Level 2: Zify.zify_convert_to_euclidean_division_equations_flag
 has value 
false

Level 2: Zify.zify_convert_to_euclidean_division_equations_flag
 has value 
false