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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 6660 |
. 2
| |
| 2 | peano1 4721 |
. . 3
| |
| 3 | peano2 4722 |
. . 3
| |
| 4 | 2, 3 | ax-mp 5 |
. 2
|
| 5 | 1, 4 | eqeltri 2307 |
1
|
| Colors of variables: wff set class |
| Syntax hints: |
| This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-ia1 106 ax-ia2 107 ax-ia3 108 ax-in1 619 ax-in2 620 ax-io 717 ax-5 1496 ax-7 1497 ax-gen 1498 ax-ie1 1542 ax-ie2 1543 ax-8 1553 ax-10 1554 ax-11 1555 ax-i12 1556 ax-bndl 1558 ax-4 1559 ax-17 1575 ax-i9 1579 ax-ial 1583 ax-i5r 1584 ax-13 2207 ax-14 2208 ax-ext 2216 ax-sep 4233 ax-nul 4241 ax-pow 4292 ax-pr 4327 ax-un 4559 |
| This theorem depends on definitions: df-bi 117 df-3an 1007 df-tru 1401 df-nf 1510 df-sb 1812 df-clab 2221 df-cleq 2227 df-clel 2230 df-nfc 2375 df-ral 2527 df-rex 2528 df-v 2817 df-dif 3216 df-un 3218 df-in 3220 df-ss 3227 df-nul 3513 df-pw 3676 df-sn 3700 df-pr 3701 df-uni 3920 df-int 3955 df-suc 4497 df-iom 4718 df-1o 6660 |
| This theorem is referenced by: 2onn 6767 nnm2 6772 nnaordex 6774 snfig 7069 snnen2og 7126 1nen2 7128 1ndom2 7132 unfiexmid 7191 en1eqsn 7231 2omap 7282 omp1eomlem 7398 fodjum 7450 fodju0 7451 nninfdcinf 7475 nninfwlporlemd 7476 nninfwlporlem 7477 en2eleq 7511 en2other2 7512 exmidfodomrlemr 7518 exmidfodomrlemrALT 7519 1pi 7646 1lt2pi 7671 archnqq 7748 nq0m0r 7787 nq02m 7796 prarloclemlt 7824 prarloclemlo 7825 1tonninf 10827 en1hash 11188 hash2 11202 fnpr2o 13603 fvpr1o 13606 upgrfi 16223 012of 16893 pwle2 16898 peano3nninf 16911 nninfall 16913 nninfsellemdc 16914 nninfsellemeq 16918 nninfsellemeqinf 16920 nninffeq 16924 sbthom 16932 isomninnlem 16940 iswomninnlem 16960 ismkvnnlem 16963 |
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