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Metamath Proof Explorer

Theorem nnq

Description: A positive integer is rational. (Contributed by NM, 17-Nov-2004)

Ref Expression
Assertion nnq 
|- ( A e. NN -> A e. QQ )

Proof

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