Metamath Proof Explorer

Theorem 11nn0

Description: 11 is a nonnegative integer. (Contributed by Umit Teoman Dogan, 10-Jun-2026)

Ref Expression
Assertion 11nn0 
|- ; 1 1 e. NN0

Proof

Step Hyp Ref Expression
1 1nn0 
 |-  1 e. NN0
2 1 1 deccl 
 |-  ; 1 1 e. NN0