Theorem zex

Description: The set of integers exists. See also zexALT . (Contributed by NM, 30-Jul-2004) (Revised by Mario Carneiro, 17-Nov-2014)

	Ref	Expression
Assertion	zex	⊢ ℤ ∈ V

Proof

Step	Hyp	Ref	Expression
1		cnex	⊢ ℂ ∈ V
2		zsscn	⊢ ℤ ⊆ ℂ
3	1 2	ssexi	⊢ ℤ ∈ V