Set: pp::colors
  Set: pp::unicode
  Assumed: a
  Assumed: b
  Assumed: c
⊥
trans (and_congr
           (refl (a = 1))
           (λ C::1 : a = 1,
              trans (and_congr (refl (b = 0)) (λ C::2 : b = 0, congr (congr2 Nat::gt C::2) C::1))
                    (and_falsel (b = 0))))
      (and_falsel (a = 1))
(a = 1 ∧ b = 0 ∧ b > a) = ⊥