Description: A positive integer is a nonnegative integer. (Contributed by NM, 20-Jun-2005)
Ref | Expression | ||
---|---|---|---|
Hypothesis | nnnn0i.1 | |
|
Assertion | nnnn0i | |
Step | Hyp | Ref | Expression |
---|---|---|---|
1 | nnnn0i.1 | |
|
2 | nnnn0 | |
|
3 | 1 2 | ax-mp | |