Set: pp::colors
  Set: pp::unicode
  Imported 'tactic'
  Assumed: f
  Assumed: Ax1
  Assumed: Ax2
  Proved: T1
theorem T1 (a : ℕ) : f (f a > 0) := eqt_elim (trans (congr2 f (congr1 0 (congr2 Nat::gt (Ax2 a)))) (Ax1 ⊥))