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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 6667 | . 2 ⊢ 1o ∈ On | |
| 2 | 1 | elexi 2828 | 1 ⊢ 1o ∈ V |
| Colors of variables: wff set class |
| Syntax hints: ∈ wcel 2205 Vcvv 2815 Oncon0 4489 1oc1o 6653 |
| 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 2207 ax-14 2208 ax-ext 2216 ax-sep 4233 ax-nul 4241 ax-pow 4292 ax-pr 4327 ax-un 4559 |
| This theorem depends on definitions: df-bi 117 df-tru 1401 df-nf 1510 df-sb 1812 df-clab 2221 df-cleq 2227 df-clel 2230 df-nfc 2375 df-ral 2527 df-rex 2528 df-v 2817 df-dif 3216 df-un 3218 df-in 3220 df-ss 3227 df-nul 3513 df-pw 3676 df-sn 3700 df-pr 3701 df-uni 3920 df-tr 4214 df-iord 4492 df-on 4494 df-suc 4497 df-1o 6660 |
| This theorem is referenced by: 2oex 6677 1lt2o 6688 map1 7067 modom 7074 rex2dom 7076 1domsn 7081 pw1fin 7183 exmidpw2en 7185 djuexb 7348 djurclr 7354 djurcl 7356 djurf1or 7361 djurf1o 7363 djuss 7374 infnninf 7428 infnninfOLD 7429 ismkvnex 7459 pr2cv1 7505 dju1p1e2 7513 exmidfodomrlemr 7518 exmidfodomrlemrALT 7519 djucomen 7536 djuassen 7537 pw1on 7549 pw1nel3 7554 sucpw1ne3 7555 sucpw1nel3 7556 fmelpw1o 7570 indpi 7673 prarloclemlt 7824 fxnn0nninf 10825 inftonninf 10828 nninfctlemfo 12761 nninfct 12762 enctlem 13267 fnpr2ob 13604 xpsfrnel 13608 djurclALT 16700 bj-charfun 16703 pw1map 16895 pw1mapen 16896 pwle2 16898 pw1nct 16903 pw1dceq 16904 exmidcon 16906 nnnninfex 16926 nninfnfiinf 16927 |
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