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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 6582 | . 2 ⊢ 1o ∈ On | |
| 2 | 1 | elexi 2813 | 1 ⊢ 1o ∈ V |
| Colors of variables: wff set class |
| Syntax hints: ∈ wcel 2200 Vcvv 2800 Oncon0 4456 1oc1o 6568 |
| 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 617 ax-in2 618 ax-io 714 ax-5 1493 ax-7 1494 ax-gen 1495 ax-ie1 1539 ax-ie2 1540 ax-8 1550 ax-10 1551 ax-11 1552 ax-i12 1553 ax-bndl 1555 ax-4 1556 ax-17 1572 ax-i9 1576 ax-ial 1580 ax-i5r 1581 ax-13 2202 ax-14 2203 ax-ext 2211 ax-sep 4203 ax-nul 4211 ax-pow 4260 ax-pr 4295 ax-un 4526 |
| This theorem depends on definitions: df-bi 117 df-tru 1398 df-nf 1507 df-sb 1809 df-clab 2216 df-cleq 2222 df-clel 2225 df-nfc 2361 df-ral 2513 df-rex 2514 df-v 2802 df-dif 3200 df-un 3202 df-in 3204 df-ss 3211 df-nul 3493 df-pw 3652 df-sn 3673 df-pr 3674 df-uni 3890 df-tr 4184 df-iord 4459 df-on 4461 df-suc 4464 df-1o 6575 |
| This theorem is referenced by: 2oex 6592 1lt2o 6603 map1 6980 modom 6987 rex2dom 6989 1domsn 6994 pw1fin 7093 exmidpw2en 7095 djuexb 7232 djurclr 7238 djurcl 7240 djurf1or 7245 djurf1o 7247 djuss 7258 infnninf 7312 infnninfOLD 7313 ismkvnex 7343 pr2cv1 7389 dju1p1e2 7396 exmidfodomrlemr 7401 exmidfodomrlemrALT 7402 djucomen 7419 djuassen 7420 pw1on 7432 pw1nel3 7437 sucpw1ne3 7438 sucpw1nel3 7439 fmelpw1o 7453 indpi 7550 prarloclemlt 7701 fxnn0nninf 10689 inftonninf 10692 nninfctlemfo 12598 nninfct 12599 enctlem 13040 fnpr2ob 13410 xpsfrnel 13414 djurclALT 16308 bj-charfun 16312 pw1map 16506 pw1mapen 16507 pwle2 16509 pw1nct 16514 pw1dceq 16515 nnnninfex 16534 nninfnfiinf 16535 |
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