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

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

State before:
case h
V : Type u_1
inst✝ : Zermelo V
x y z z✝ : V
⊢ z✝ ∈ x ∪ y ∩ z ↔ z✝ ∈ (x ∪ y) ∩ (x ∪ z)
Tactic:
aesop
State after:
no goals