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Metamath Proof Explorer

Theorem ensym

Description: Symmetry of equinumerosity. Theorem 2 of Suppes p. 92. (Contributed by NM, 26-Oct-2003) (Revised by Mario Carneiro, 26-Apr-2015)

		Ref	Expression
	Assertion	ensym	$⊢ A \approx B \to B \approx A$

Step	Hyp	Ref	Expression
1		ensymb	$⊢ A \approx B \leftrightarrow B \approx A$
2	1	biimpi	$⊢ A \approx B \to B \approx A$