Description: An integer is strictly greater than zero iff it is a member of NN . (Contributed by Mario Carneiro, 29-Sep-2015)
Ref | Expression | ||
---|---|---|---|
Assertion | lbfzo0 | |
Step | Hyp | Ref | Expression |
---|---|---|---|
1 | 0z | |
|
2 | 3anass | |
|
3 | 1 2 | mpbiran | |
4 | fzolb | |
|
5 | elnnz | |
|
6 | 3 4 5 | 3bitr4i | |