exact ⟨p ⋎ q, by simp, by simp [hq]⟩
case inr.inl
L : Language
Δ : List (SyntacticFormula L)
p q : SyntacticFormula L
d : Derivation (p :: q :: Δ)
M : Type u_1
s : Structure L M
ε : ℕ → M
hq : (Evalfm M ε) q
⊢ ∃ p_1 ∈ p ⋎ q :: Δ, (Evalfm M ε) p_1
no goals