Metamath Proof Explorer

Theorem 11nn

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

Ref Expression
Assertion 11nn 
|- ; 1 1 e. NN

Proof

Step Hyp Ref Expression
1 1nn0 
 |-  1 e. NN0
2 1nn 
 |-  1 e. NN
3 1 2 decnncl 
 |-  ; 1 1 e. NN