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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 6699 | . 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 4510 1oc1o 6685 |
| 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 4251 ax-nul 4261 ax-pow 4313 ax-pr 4348 ax-un 4580 |
| 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 4232 df-iord 4513 df-on 4515 df-suc 4518 df-1o 6692 |
| This theorem is used by: 2oex 6709 1lt2o 6720 map1 7107 modom 7114 rex2dom 7116 1domsn 7121 pw1fin 7223 exmidpw2en 7225 djuexb 7390 djurclr 7396 djurcl 7398 djurf1or 7403 djurf1o 7405 djuss 7416 infnninf 7470 infnninfOLD 7471 ismkvnex 7501 pr2cv1 7547 dju1p1e2 7555 exmidfodomrlemr 7560 exmidfodomrlemrALT 7561 djucomen 7578 djuassen 7579 pw1on 7591 pw1nel3 7596 sucpw1ne3 7597 sucpw1nel3 7598 fmelpw1o 7612 indpi 7715 prarloclemlt 7866 fxnn0nninf 10896 inftonninf 10899 nninfctlemfo 12841 nninfct 12842 enctlem 13380 fnpr2ob 13719 xpsfrnel 13723 djurclALT 17052 bj-charfun 17055 pw1map 17247 pw1mapen 17248 pwle2 17250 pw1nct 17255 pw1dceq 17257 exmidcon 17259 stnot 17261 wexmiddc 17264 wexmiddifxylem 17267 wexmiddifxy 17268 idjudju 17269 nnnninfex 17288 nninfnfiinf 17289 |
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