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Metamath Proof Explorer

Theorem zct

Description: The set of integer numbers is countable. (Contributed by Glauco Siliprandi, 17-Aug-2020)

		Ref	Expression
	Assertion	zct	$⊢ ℤ ≼ ω$

Step	Hyp	Ref	Expression
1		zenom	$⊢ ℤ \approx ω$
2		endom	$⊢ ℤ \approx ω \to ℤ ≼ ω$
3	1 2	ax-mp	$⊢ ℤ ≼ ω$