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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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