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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 6632 | . 2 ⊢ 1o ∈ On | |
| 2 | 1 | elexi 2816 | 1 ⊢ 1o ∈ V |
| Colors of variables: wff set class |
| Syntax hints: ∈ wcel 2202 Vcvv 2803 Oncon0 4466 1oc1o 6618 |
| 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 717 ax-5 1496 ax-7 1497 ax-gen 1498 ax-ie1 1542 ax-ie2 1543 ax-8 1553 ax-10 1554 ax-11 1555 ax-i12 1556 ax-bndl 1558 ax-4 1559 ax-17 1575 ax-i9 1579 ax-ial 1583 ax-i5r 1584 ax-13 2204 ax-14 2205 ax-ext 2213 ax-sep 4212 ax-nul 4220 ax-pow 4270 ax-pr 4305 ax-un 4536 |
| This theorem depends on definitions: df-bi 117 df-tru 1401 df-nf 1510 df-sb 1811 df-clab 2218 df-cleq 2224 df-clel 2227 df-nfc 2364 df-ral 2516 df-rex 2517 df-v 2805 df-dif 3203 df-un 3205 df-in 3207 df-ss 3214 df-nul 3497 df-pw 3658 df-sn 3679 df-pr 3680 df-uni 3899 df-tr 4193 df-iord 4469 df-on 4471 df-suc 4474 df-1o 6625 |
| This theorem is referenced by: 2oex 6642 1lt2o 6653 map1 7030 modom 7037 rex2dom 7039 1domsn 7044 pw1fin 7145 exmidpw2en 7147 djuexb 7286 djurclr 7292 djurcl 7294 djurf1or 7299 djurf1o 7301 djuss 7312 infnninf 7366 infnninfOLD 7367 ismkvnex 7397 pr2cv1 7443 dju1p1e2 7451 exmidfodomrlemr 7456 exmidfodomrlemrALT 7457 djucomen 7474 djuassen 7475 pw1on 7487 pw1nel3 7492 sucpw1ne3 7493 sucpw1nel3 7494 fmelpw1o 7508 indpi 7605 prarloclemlt 7756 fxnn0nninf 10747 inftonninf 10750 nninfctlemfo 12674 nninfct 12675 enctlem 13116 fnpr2ob 13486 xpsfrnel 13490 djurclALT 16503 bj-charfun 16506 pw1map 16700 pw1mapen 16701 pwle2 16703 pw1nct 16708 pw1dceq 16709 exmidcon 16711 nnnninfex 16731 nninfnfiinf 16732 |
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