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| Mirrors > Home > ILE Home > Th. List > nnnn0d | Unicode version | ||
| Description: A positive integer is a nonnegative integer. (Contributed by Mario Carneiro, 27-May-2016.) |
| Ref | Expression |
|---|---|
| nnnn0d.1 |
|
| Ref | Expression |
|---|---|
| nnnn0d |
|
| Step | Hyp | Ref | Expression |
|---|---|---|---|
| 1 | nnssnn0 9252 |
. 2
| |
| 2 | nnnn0d.1 |
. 2
| |
| 3 | 1, 2 | sselid 3181 |
1
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