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Mirrors > Home > ILE Home > Th. List > df2o2 | GIF version |
Description: Expanded value of the ordinal number 2. (Contributed by NM, 29-Jan-2004.) |
Ref | Expression |
---|---|
df2o2 | ⊢ 2o = {∅, {∅}} |
Step | Hyp | Ref | Expression |
---|---|---|---|
1 | df2o3 6389 | . 2 ⊢ 2o = {∅, 1o} | |
2 | df1o2 6388 | . . 3 ⊢ 1o = {∅} | |
3 | 2 | preq2i 3651 | . 2 ⊢ {∅, 1o} = {∅, {∅}} |
4 | 1, 3 | eqtri 2185 | 1 ⊢ 2o = {∅, {∅}} |
Colors of variables: wff set class |
Syntax hints: = wceq 1342 ∅c0 3404 {csn 3570 {cpr 3571 1oc1o 6368 2oc2o 6369 |
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-ext 2146 |
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-v 2723 df-dif 3113 df-un 3115 df-nul 3405 df-sn 3576 df-pr 3577 df-suc 4343 df-1o 6375 df-2o 6376 |
This theorem is referenced by: 2dom 6762 exmidpw 6865 exmidpweq 6866 pr0hash2ex 10717 ss1oel2o 13707 |
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