Metamath Proof Explorer


Theorem zcn

Description: An integer is a complex number. (Contributed by NM, 9-May-2004)

Ref Expression
Assertion zcn
|- ( N e. ZZ -> N e. CC )

Proof

Step Hyp Ref Expression
1 zre
 |-  ( N e. ZZ -> N e. RR )
2 1 recnd
 |-  ( N e. ZZ -> N e. CC )