Theorem: IntuitionisticPropositionalLogic.ProvableFrom.insert (GlimpseOfLean/Exercises/Topics/IntuitionisticPropositionalLogic.lean)

State before:
H : Type ?u.21714
inst✝ : HeytingAlgebra H
v : Variable → H
A B : Formula
Γ Δ : Set Formula
h : Γ ⊢ A
⊢ Insert.insert B Γ ⊢ A
Tactic:
sorry
State after:
no goals