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Mirrors > Home > ILE Home > Th. List > 1oex | Unicode version |
Description: Ordinal 1 is a set. (Contributed by BJ, 4-Jul-2022.) |
Ref | Expression |
---|---|
1oex |
Step | Hyp | Ref | Expression |
---|---|---|---|
1 | 1on 6382 | . 2 | |
2 | 1 | elexi 2733 | 1 |
Colors of variables: wff set class |
Syntax hints: wcel 2135 cvv 2721 con0 4335 c1o 6368 |
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 1434 ax-7 1435 ax-gen 1436 ax-ie1 1480 ax-ie2 1481 ax-8 1491 ax-10 1492 ax-11 1493 ax-i12 1494 ax-bndl 1496 ax-4 1497 ax-17 1513 ax-i9 1517 ax-ial 1521 ax-i5r 1522 ax-13 2137 ax-14 2138 ax-ext 2146 ax-sep 4094 ax-nul 4102 ax-pow 4147 ax-pr 4181 ax-un 4405 |
This theorem depends on definitions: df-bi 116 df-tru 1345 df-nf 1448 df-sb 1750 df-clab 2151 df-cleq 2157 df-clel 2160 df-nfc 2295 df-ral 2447 df-rex 2448 df-v 2723 df-dif 3113 df-un 3115 df-in 3117 df-ss 3124 df-nul 3405 df-pw 3555 df-sn 3576 df-pr 3577 df-uni 3784 df-tr 4075 df-iord 4338 df-on 4340 df-suc 4343 df-1o 6375 |
This theorem is referenced by: 1lt2o 6401 map1 6769 1domsn 6776 pw1fin 6867 djuexb 7000 djurclr 7006 djurcl 7008 djurf1or 7013 djurf1o 7015 djuss 7026 infnninf 7079 infnninfOLD 7080 ismkvnex 7110 dju1p1e2 7144 exmidfodomrlemr 7149 exmidfodomrlemrALT 7150 djucomen 7163 djuassen 7164 pw1on 7173 pw1nel3 7178 sucpw1ne3 7179 sucpw1nel3 7180 indpi 7274 prarloclemlt 7425 fxnn0nninf 10363 inftonninf 10366 enctlem 12302 djurclALT 13518 fmelpw1o 13523 bj-charfun 13524 pwle2 13712 pw1nct 13717 |
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