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Metamath Proof Explorer

Theorem zsscn

Description: The integers are a subset of the complex numbers. (Contributed by NM, 2-Aug-2004)

Ref Expression
Assertion zsscn 
|- ZZ C_ CC

Proof

Step Hyp Ref Expression
1 zcn 
 |-  ( x e. ZZ -> x e. CC )
2 1 ssriv 
 |-  ZZ C_ CC