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| Mirrors > Home > ILE Home > Th. List > 1oex | GIF version | ||
| Description: Ordinal 1 is a set. (Contributed by BJ, 4-Jul-2022.) |
| Ref | Expression |
|---|---|
| 1oex | ⊢ 1o ∈ V |
| Step | Hyp | Ref | Expression |
|---|---|---|---|
| 1 | 1on 6694 | . 2 ⊢ 1o ∈ On | |
| 2 | 1 | elexi 2834 | 1 ⊢ 1o ∈ V |
| Colors of variables: wff set class |
| This proof depends on syntax axioms: ∈ wcel 2209 Vcvv 2821 Oncon0 4508 1oc1o 6680 |
| 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-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-tr 4230 df-iord 4511 df-on 4513 df-suc 4516 df-1o 6687 |
| This theorem is used by: 2oex 6704 1lt2o 6715 map1 7101 modom 7108 rex2dom 7110 1domsn 7115 pw1fin 7217 exmidpw2en 7219 djuexb 7385 djurclr 7391 djurcl 7393 djurf1or 7398 djurf1o 7400 djuss 7411 infnninf 7465 infnninfOLD 7466 ismkvnex 7496 pr2cv1 7542 dju1p1e2 7550 exmidfodomrlemr 7555 exmidfodomrlemrALT 7556 djucomen 7573 djuassen 7574 pw1on 7586 pw1nel3 7591 sucpw1ne3 7592 sucpw1nel3 7593 fmelpw1o 7607 indpi 7710 prarloclemlt 7861 fxnn0nninf 10891 inftonninf 10894 nninfctlemfo 12836 nninfct 12837 enctlem 13375 fnpr2ob 13713 xpsfrnel 13717 djurclALT 16958 bj-charfun 16961 pw1map 17153 pw1mapen 17154 pwle2 17156 pw1nct 17161 pw1dceq 17163 exmidcon 17165 stnot 17167 wexmiddc 17170 wexmiddifxylem 17173 wexmiddifxy 17174 nnnninfex 17193 nninfnfiinf 17194 |
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