Metamath Proof Explorer


Theorem inex2g

Description: Sufficient condition for an intersection to be a set. Commuted form of inex1g . (Contributed by Peter Mazsa, 19-Dec-2018)

Ref Expression
Assertion inex2g ⊢ A ∈ V → B ∩ A ∈ V

Proof

Step Hyp Ref Expression
1 incom ⊢ B ∩ A = A ∩ B
2 inex1g ⊢ A ∈ V → A ∩ B ∈ V
3 1 2 eqeltrid ⊢ A ∈ V → B ∩ A ∈ V