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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 6328 | . 2 ⊢ 1o ∈ On | |
2 | 1 | elexi 2701 | 1 ⊢ 1o ∈ V |
Colors of variables: wff set class |
Syntax hints: ∈ wcel 1481 Vcvv 2689 Oncon0 4293 1oc1o 6314 |
This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-ia1 105 ax-ia2 106 ax-ia3 107 ax-in1 604 ax-in2 605 ax-io 699 ax-5 1424 ax-7 1425 ax-gen 1426 ax-ie1 1470 ax-ie2 1471 ax-8 1483 ax-10 1484 ax-11 1485 ax-i12 1486 ax-bndl 1487 ax-4 1488 ax-13 1492 ax-14 1493 ax-17 1507 ax-i9 1511 ax-ial 1515 ax-i5r 1516 ax-ext 2122 ax-sep 4054 ax-nul 4062 ax-pow 4106 ax-pr 4139 ax-un 4363 |
This theorem depends on definitions: df-bi 116 df-tru 1335 df-nf 1438 df-sb 1737 df-clab 2127 df-cleq 2133 df-clel 2136 df-nfc 2271 df-ral 2422 df-rex 2423 df-v 2691 df-dif 3078 df-un 3080 df-in 3082 df-ss 3089 df-nul 3369 df-pw 3517 df-sn 3538 df-pr 3539 df-uni 3745 df-tr 4035 df-iord 4296 df-on 4298 df-suc 4301 df-1o 6321 |
This theorem is referenced by: 1lt2o 6347 map1 6714 1domsn 6721 djuexb 6937 djurclr 6943 djurcl 6945 djurf1or 6950 djurf1o 6952 djuss 6963 infnninf 7030 nnnninf 7031 ismkvnex 7037 dju1p1e2 7070 exmidfodomrlemr 7075 exmidfodomrlemrALT 7076 djucomen 7089 djuassen 7090 indpi 7174 prarloclemlt 7325 fxnn0nninf 10242 inftonninf 10245 enctlem 11981 djurclALT 13180 pwle2 13366 pw1nct 13371 |
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