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Metamath Proof Explorer

Theorem encv

Description: If two classes are equinumerous, both classes are sets. (Contributed by AV, 21-Mar-2019)

		Ref	Expression
	Assertion	encv	$⊢ A \approx B \to (A \in V \land B \in V)$

Step	Hyp	Ref	Expression
1		relen	$⊢ Rel \approx$
2	1	brrelex12i	$⊢ A \approx B \to (A \in V \land B \in V)$