Metamath Proof Explorer

Theorem 1oelpr

Description: 1o is an element of { (/) , 1o } . (Contributed by Umit Teoman Dogan, 10-Jun-2026)

Ref Expression
Assertion 1oelpr 
|- 1o e. { (/) , 1o }

Proof

Step Hyp Ref Expression
1 1oex 
 |-  1o e. _V
2 1 prid2 
 |-  1o e. { (/) , 1o }