Metamath Proof Explorer

Theorem 10nn0

Description: 10 is a nonnegative integer. (Contributed by Mario Carneiro, 19-Apr-2015) (Revised by AV, 6-Sep-2021)

Ref Expression
Assertion 10nn0 
|- ; 1 0 e. NN0

Proof

Step Hyp Ref Expression
1 1nn0 
 |-  1 e. NN0
2 0nn0 
 |-  0 e. NN0
3 1 2 deccl 
 |-  ; 1 0 e. NN0