Metamath Proof Explorer

Theorem zssre

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

Ref Expression
Assertion zssre 
|- ZZ C_ RR

Proof

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