simp_all only [ValidOnFrame.models_iff, ValidOnFrame, ValidOnModel.iff_models]
α : Type u_1
inst✝ : Inhabited α
F : Frame' α
p q r : Formula α
⊢ F ⊧ p ⟶ q ⟶ p
α : Type u_1
inst✝ : Inhabited α
F : Frame' α
p q r : Formula α
⊢ ∀ (V : Valuation F.World α) (h : ∀ {w₁ w₂ : F.World}, w₁ ≺ w₂ → ∀ {a : α}, V w₁ a → V w₂ a),
    ValidOnModel { Frame := F, Valuation := V, hereditary := h } (p ⟶ q ⟶ p)