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| Mirrors > Home > ILE Home > Th. List > 1onn | Unicode version | ||
| Description: One is a natural number. (Contributed by NM, 29-Oct-1995.) |
| Ref | Expression |
|---|---|
| 1onn |
|
| Step | Hyp | Ref | Expression |
|---|---|---|---|
| 1 | df-1o 6687 |
. 2
| |
| 2 | peano1 4741 |
. . 3
| |
| 3 | peano2 4742 |
. . 3
| |
| 4 | 2, 3 | ax-mp 5 |
. 2
|
| 5 | 1, 4 | eqeltri 2311 |
1
|
| Colors of variables: wff set class |
| This proof depends on syntax axioms:
|
| This proof depends on axioms: ax-mp 5 ax-1 6 ax-2 7 ax-ia1 106 ax-ia2 107 ax-ia3 108 ax-in1 623 ax-in2 624 ax-io 721 ax-5 1500 ax-7 1501 ax-gen 1502 ax-ie1 1546 ax-ie2 1547 ax-8 1557 ax-10 1558 ax-11 1559 ax-i12 1560 ax-bndl 1562 ax-4 1563 ax-17 1579 ax-i9 1583 ax-ial 1587 ax-i5r 1588 ax-14 2212 ax-ext 2220 ax-sep 4249 ax-nul 4259 ax-pow 4311 ax-pr 4346 ax-un 4578 |
| This proof depends on definitions: df-bi 117 df-3an 1011 df-tru 1405 df-nf 1514 df-sb 1816 df-clab 2225 df-cleq 2231 df-clel 2234 df-nfc 2381 df-ral 2533 df-rex 2534 df-v 2823 df-dif 3222 df-un 3224 df-in 3226 df-ss 3233 df-nul 3521 df-pw 3690 df-sn 3715 df-pr 3716 df-uni 3936 df-int 3971 df-suc 4516 df-iom 4738 df-1o 6687 |
| This theorem is used by: 2onn 6794 nnm2 6799 nnaordex 6801 snfig 7103 snnen2og 7160 1nen2 7162 1ndom2 7166 unfiexmid 7225 en1eqsn 7265 2omap 7318 omp1eomlem 7434 fodjum 7486 fodju0 7487 nninfdcinf 7511 nninfwlporlemd 7512 nninfwlporlem 7513 en2eleq 7547 en2other2 7548 exmidfodomrlemr 7554 exmidfodomrlemrALT 7555 1pi 7682 1lt2pi 7707 archnqq 7784 nq0m0r 7823 nq02m 7832 prarloclemlt 7860 prarloclemlo 7861 1tonninf 10878 en1hash 11239 hash2 11253 fnpr2o 13660 fvpr1o 13663 upgrfi 16343 012of 17023 pwle2 17028 peano3nninf 17050 nninfall 17052 nninfsellemdc 17053 nninfsellemeq 17057 nninfsellemeqinf 17059 nninffeq 17063 sbthom 17071 isomninnlem 17079 iswomninnlem 17099 ismkvnnlem 17102 |
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