Metamath Proof Explorer

Theorem 1elpr01

Description: 1 is an element of { 0 , 1 } . (Contributed by Umit Teoman Dogan, 10-Jun-2026)

Ref Expression
Assertion 1elpr01 
|- 1 e. { 0 , 1 }

Proof

Step Hyp Ref Expression
1 1ex 
 |-  1 e. _V
2 1 prid2 
 |-  1 e. { 0 , 1 }