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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 6589 | . 2 ⊢ 1o ∈ On | |
| 2 | 1 | elexi 2815 | 1 ⊢ 1o ∈ V |
| Colors of variables: wff set class |
| Syntax hints: ∈ wcel 2202 Vcvv 2802 Oncon0 4460 1oc1o 6575 |
| 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 619 ax-in2 620 ax-io 716 ax-5 1495 ax-7 1496 ax-gen 1497 ax-ie1 1541 ax-ie2 1542 ax-8 1552 ax-10 1553 ax-11 1554 ax-i12 1555 ax-bndl 1557 ax-4 1558 ax-17 1574 ax-i9 1578 ax-ial 1582 ax-i5r 1583 ax-13 2204 ax-14 2205 ax-ext 2213 ax-sep 4207 ax-nul 4215 ax-pow 4264 ax-pr 4299 ax-un 4530 |
| This theorem depends on definitions: df-bi 117 df-tru 1400 df-nf 1509 df-sb 1811 df-clab 2218 df-cleq 2224 df-clel 2227 df-nfc 2363 df-ral 2515 df-rex 2516 df-v 2804 df-dif 3202 df-un 3204 df-in 3206 df-ss 3213 df-nul 3495 df-pw 3654 df-sn 3675 df-pr 3676 df-uni 3894 df-tr 4188 df-iord 4463 df-on 4465 df-suc 4468 df-1o 6582 |
| This theorem is referenced by: 2oex 6599 1lt2o 6610 map1 6987 modom 6994 rex2dom 6996 1domsn 7001 pw1fin 7102 exmidpw2en 7104 djuexb 7243 djurclr 7249 djurcl 7251 djurf1or 7256 djurf1o 7258 djuss 7269 infnninf 7323 infnninfOLD 7324 ismkvnex 7354 pr2cv1 7400 dju1p1e2 7408 exmidfodomrlemr 7413 exmidfodomrlemrALT 7414 djucomen 7431 djuassen 7432 pw1on 7444 pw1nel3 7449 sucpw1ne3 7450 sucpw1nel3 7451 fmelpw1o 7465 indpi 7562 prarloclemlt 7713 fxnn0nninf 10702 inftonninf 10705 nninfctlemfo 12616 nninfct 12617 enctlem 13058 fnpr2ob 13428 xpsfrnel 13432 djurclALT 16424 bj-charfun 16428 pw1map 16622 pw1mapen 16623 pwle2 16625 pw1nct 16630 pw1dceq 16631 nnnninfex 16650 nninfnfiinf 16651 |
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