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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 6575 | . 2 ⊢ 1o ∈ On | |
| 2 | 1 | elexi 2812 | 1 ⊢ 1o ∈ V |
| Colors of variables: wff set class |
| Syntax hints: ∈ wcel 2200 Vcvv 2799 Oncon0 4454 1oc1o 6561 |
| 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 4202 ax-nul 4210 ax-pow 4258 ax-pr 4293 ax-un 4524 |
| 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 2801 df-dif 3199 df-un 3201 df-in 3203 df-ss 3210 df-nul 3492 df-pw 3651 df-sn 3672 df-pr 3673 df-uni 3889 df-tr 4183 df-iord 4457 df-on 4459 df-suc 4462 df-1o 6568 |
| This theorem is referenced by: 2oex 6585 1lt2o 6596 map1 6973 rex2dom 6979 1domsn 6984 pw1fin 7083 exmidpw2en 7085 djuexb 7222 djurclr 7228 djurcl 7230 djurf1or 7235 djurf1o 7237 djuss 7248 infnninf 7302 infnninfOLD 7303 ismkvnex 7333 pr2cv1 7379 dju1p1e2 7386 exmidfodomrlemr 7391 exmidfodomrlemrALT 7392 djucomen 7409 djuassen 7410 pw1on 7422 pw1nel3 7427 sucpw1ne3 7428 sucpw1nel3 7429 fmelpw1o 7443 indpi 7540 prarloclemlt 7691 fxnn0nninf 10673 inftonninf 10676 nninfctlemfo 12576 nninfct 12577 enctlem 13018 fnpr2ob 13388 xpsfrnel 13392 djurclALT 16221 bj-charfun 16225 pw1map 16420 pw1mapen 16421 pwle2 16423 pw1nct 16428 pw1dceq 16429 nnnninfex 16448 nninfnfiinf 16449 |
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