Metamath Proof Explorer

Theorem 2fno

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

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

Proof

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