have := BProof.proveList l₇
case nil.cons
t : Th
Δ : Ctx
h₁ : ↑t ∩ Δ = ∅
h₂ : isDisjunctionClosed Δ
i j : ℕ
w₁ : Form
l₃ : ▲lindenbaumSequence t Δ (i, j) ∩ Δ = ∅
w₂ : Form
l₅ : w₁¦w₂ ∈ Δ
prf₅ :
  BProof (lindenbaumSequence t Δ (i, j + 0))
    ((Denumerable.ofNat (Form × Form) (j + 0)).fst¦(Denumerable.ofNat (Form × Form) (j + 0)).snd)
l₆ : { x | x ∈ [] } ⊆ lindenbaumSequence t Δ (i, j + 0)
head : Form
tail : List Form
l₇ : { x | x ∈ head :: tail } ⊆ lindenbaumSequence t Δ (i, j + 0)
thm₃ :
  BTheorem
    (Form.conjoinList (Denumerable.ofNat (Form × Form) (j + 0)).fst
          (head :: tail)¦Form.conjoinList (Denumerable.ofNat (Form × Form) (j + 0)).snd []⊃w₁¦w₂)
⊢ False
case nil.cons
t : Th
Δ : Ctx
h₁ : ↑t ∩ Δ = ∅
h₂ : isDisjunctionClosed Δ
i j : ℕ
w₁ : Form
l₃ : ▲lindenbaumSequence t Δ (i, j) ∩ Δ = ∅
w₂ : Form
l₅ : w₁¦w₂ ∈ Δ
prf₅ :
  BProof (lindenbaumSequence t Δ (i, j + 0))
    ((Denumerable.ofNat (Form × Form) (j + 0)).fst¦(Denumerable.ofNat (Form × Form) (j + 0)).snd)
l₆ : { x | x ∈ [] } ⊆ lindenbaumSequence t Δ (i, j + 0)
head : Form
tail : List Form
l₇ : { x | x ∈ head :: tail } ⊆ lindenbaumSequence t Δ (i, j + 0)
thm₃ :
  BTheorem
    (Form.conjoinList (Denumerable.ofNat (Form × Form) (j + 0)).fst
          (head :: tail)¦Form.conjoinList (Denumerable.ofNat (Form × Form) (j + 0)).snd []⊃w₁¦w₂)
this : BProof (lindenbaumSequence t Δ (i, j + 0)) (Form.conjoinList head tail)
⊢ False