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Metamath Proof Explorer

Theorem nnre

Description: A positive integer is a real number. (Contributed by NM, 18-Aug-1999)

Ref Expression
Assertion nnre 
|- ( A e. NN -> A e. RR )

Proof

Step Hyp Ref Expression
1 nnssre 
 |-  NN C_ RR
2 1 sseli 
 |-  ( A e. NN -> A e. RR )