Metamath Proof Explorer

Theorem nnsno

Description: A positive surreal integer is a surreal. (Contributed by Scott Fenton, 15-Apr-2025)

Ref Expression
Assertion nnsno 
|- ( A e. NN_s -> A e. No )

Proof

Step Hyp Ref Expression
1 nnssno 
 |-  NN_s C_ No
2 1 sseli 
 |-  ( A e. NN_s -> A e. No )