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Metamath Proof Explorer

Theorem ctex

Description: A countable set is a set. (Contributed by Thierry Arnoux, 29-Dec-2016) (Proof shortened by Jim Kingdon, 13-Mar-2023)

		Ref	Expression
	Assertion	ctex	$⊢ A ≼ ω \to A \in V$

Step	Hyp	Ref	Expression
1		reldom	$⊢ Rel ≼$
2	1	brrelex1i	$⊢ A ≼ ω \to A \in V$