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| Description: A natural number is ordinal. |
| Ref | Expression |
|---|---|
| nnord |
|
| Step | Hyp | Ref | Expression |
|---|---|---|---|
| 1 | nnon 3957 |
. 2
| |
| 2 | eloni 3667 |
. 2
| |
| 3 | 1, 2 | syl 12 |
1
|
| Colors of variables: wff set class |
| Syntax hints: |
| This theorem is referenced by: ordomOLD 3961 nnlim 3964 nnsuc 3969 omsmo 5314 ac6sfilem3 5508 phplem1 5602 phplem2 5603 phplem3 5604 phplem4 5605 php 5607 php4 5610 nndomo 5614 omsucdom 5616 ominf 5622 pssnn 5628 unblem1 5633 isfinite2 5639 unfilem1 5641 fodomfi 5656 inf3lem5 5723 inf3lem6 5724 elni2 6157 piord 6160 addnidpi 6180 indpi 6186 om2uzf1oi 7712 dif1en 10172 bnj529 12535 bnj566 12544 bnj948 12847 bnj1098 12917 bnj594 13300 bnj580 13301 bnj1001 13366 bnj1053 13396 bnj1071 13402 finminlem 15367 fictb 15371 |
| This theorem was proved from axioms: ax-1 4 ax-2 5 ax-3 6 ax-mp 7 ax-7 1304 ax-gen 1305 ax-8 1306 ax-9 1307 ax-10 1308 ax-11 1309 ax-12 1310 ax-13 1311 ax-14 1312 ax-17 1317 ax-4 1319 ax-5o 1321 ax-6o 1324 ax-9o 1481 ax-10o 1500 ax-16 1580 ax-11o 1588 ax-ext 1865 ax-sep 3438 ax-nul 3445 ax-pow 3481 ax-pr 3524 ax-un 3790 |
| This theorem depends on definitions: df-bi 164 df-or 241 df-an 242 df-3or 859 df-3an 860 df-ex 1327 df-sb 1536 df-eu 1775 df-mo 1776 df-clab 1872 df-cleq 1877 df-clel 1880 df-ne 2019 df-ral 2109 df-rex 2110 df-rab 2112 df-v 2294 df-dif 2597 df-un 2600 df-in 2603 df-ss 2605 df-pss 2607 df-nul 2876 df-pw 3035 df-sn 3049 df-pr 3050 df-tp 3052 df-op 3053 df-uni 3178 df-br 3339 df-opab 3396 df-tr 3412 df-eprel 3583 df-po 3591 df-so 3604 df-fr 3625 df-we 3644 df-ord 3660 df-on 3661 df-lim 3662 df-suc 3663 df-om 3950 |