Metamath Proof Explorer


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 V

Proof

Step Hyp Ref Expression
1 cnex V
2 zsscn
3 1 2 ssexi V