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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 ≈ ω
2		endom	⊢ ( ℤ ≈ ω → ℤ ≼ ω )
3	1 2	ax-mp	⊢ ℤ ≼ ω