case intro.intro
Γ : Type u_1
inst✝ : Inhabited Γ
l₁ : List Γ
i j : ℕ
⊢ BlankExtends l₁ (l₁ ++ List.replicate i default ++ List.replicate j default)
Γ : Type u_1
inst✝ : Inhabited Γ
l₁ l₂ l₃ : List Γ
⊢ BlankExtends l₁ l₂ → BlankExtends l₂ l₃ → BlankExtends l₁ l₃
rintro ⟨i, rfl⟩ ⟨j, rfl⟩
no goals
case intro.intro
Γ : Type u_1
inst✝ : Inhabited Γ
l₁ : List Γ
i j : ℕ
⊢ BlankExtends l₁ (l₁ ++ List.replicate i default ++ List.replicate j default)
exact ⟨i + j, by simp [List.replicate_add]⟩
no goals
Γ : Type u_1
inst✝ : Inhabited Γ
l₁ : List Γ
i j : ℕ
⊢ l₁ ++ List.replicate i default ++ List.replicate j default = l₁ ++ List.replicate (i + j) default
simp [List.replicate_add]