Theorem zct

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

	Ref	Expression
Assertion	zct	⊢ ℤ ≼ ω

Proof

Step	Hyp	Ref	Expression
1		zenom	⊢ ℤ ≈ ω
2		endom	⊢ ( ℤ ≈ ω → ℤ ≼ ω )
3	1 2	ax-mp	⊢ ℤ ≼ ω