Metamath Proof Explorer

Theorem 3no

Description: Ordinal three maps to a surreal number. (Contributed by RP, 21-Sep-2023)

Ref Expression
Assertion 3no 
|- ( 3o X. { 2o } ) e. No

Proof

Step Hyp Ref Expression
1 3on 
 |-  3o e. On
2 1 onnoi 
 |-  ( 3o X. { 2o } ) e. No