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| Mirrors > Home > MPE Home > Th. List > nn0p1nn | Structured version Visualization version Unicode version | ||
| Description: A nonnegative integer plus 1 is a positive integer. Strengthening of peano2nn 11032. (Contributed by Raph Levien, 30-Jun-2006.) (Revised by Mario Carneiro, 16-May-2014.) |
| Ref | Expression |
|---|---|
| nn0p1nn |
|
| Step | Hyp | Ref | Expression |
|---|---|---|---|
| 1 | 1nn 11031 |
. 2
| |
| 2 | nn0nnaddcl 11324 |
. 2
| |
| 3 | 1, 2 | mpan2 707 |
1
|
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