Theorem: SetTheory.empty_inter (SetTheory/Basic.lean)

State before:
V : Type u_1
inst✝ : Zermelo V
x y z : V
⊢ ∅ ∩ x = ∅
Tactic:
ext
State after:
case h
V : Type u_1
inst✝ : Zermelo V
x y z z✝ : V
⊢ z✝ ∈ ∅ ∩ x ↔ z✝ ∈ ∅

State before:
case h
V : Type u_1
inst✝ : Zermelo V
x y z z✝ : V
⊢ z✝ ∈ ∅ ∩ x ↔ z✝ ∈ ∅
Tactic:
simp
State after:
no goals