exists .ε
Γ : Type
inst✝ : Alphabet Γ
w : Fin (RankedAlphabet.rank (RankedAlphabet.lift Γ) none) → Term (RankedAlphabet.lift Γ) Empty
hi : ∀ (a : Fin (RankedAlphabet.rank (RankedAlphabet.lift Γ) none)), ∃ a_1, treeₑ a_1 = w a
⊢ ∃ a, treeₑ a = app none w
Γ : Type
inst✝ : Alphabet Γ
w : Fin (RankedAlphabet.rank (RankedAlphabet.lift Γ) none) → Term (RankedAlphabet.lift Γ) Empty
hi : ∀ (a : Fin (RankedAlphabet.rank (RankedAlphabet.lift Γ) none)), ∃ a_1, treeₑ a_1 = w a
⊢ treeₑ Word.ε = app none w