case inr h₄ => exact (Set.not_nonempty_iff_eq_empty.mpr l₃) ⟨w₁, l₁, l₂⟩
t : Th
Δ : Ctx
h₁ : ↑t ∩ Δ = ∅
h₂ : isDisjunctionClosed Δ
i j : ℕ
w₁ : Form
l₂ : w₁ ∈ Δ
l₃ : ▲lindenbaumSequence t Δ (i, j) ∩ Δ = ∅
h₄ :
  ¬(Denumerable.ofNat (Form × Form) (j + 0)).fst¦(Denumerable.ofNat (Form × Form) (j + 0)).snd ∈
      ▲lindenbaumSequence t Δ (i, j + 0)
l₁ : w₁ ∈ ▲lindenbaumSequence t Δ (i, j + 0)
⊢ False
no goals