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| Description: An ordinal number is a subset of the class of ordinal numbers. |
| Ref | Expression |
|---|---|
| onss |
|
| Step | Hyp | Ref | Expression |
|---|---|---|---|
| 1 | eloni 3667 |
. 2
| |
| 2 | ordsson 3867 |
. 2
| |
| 3 | 1, 2 | syl 12 |
1
|
| Colors of variables: wff set class |
| Syntax hints: |
| This theorem is referenced by: onuni 3874 suceloni 3894 onssi 3918 tfi 3937 tfr3 5134 tz7.49 5168 tz7.49c 5169 ordtypelem2 5685 ordtypelem5 5688 ordtypelem7 5690 zorn2lem2 5951 predon 13904 soseq 13955 axfelem8 14038 axfelem9 14039 valdom 15261 eltintpar 15276 inttaror 15277 ordtypelem2OLD 15376 ordtypelem5OLD 15379 ordtypelem7OLD 15381 |
| 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-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 |