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| Mirrors > Home > ILE Home > Th. List > df1o2 | GIF version | ||
| Description: Expanded value of the ordinal number 1. (Contributed by NM, 4-Nov-2002.) |
| Ref | Expression |
|---|---|
| df1o2 | ⊢ 1o = {∅} |
| Step | Hyp | Ref | Expression |
|---|---|---|---|
| 1 | df-1o 6582 | . 2 ⊢ 1o = suc ∅ | |
| 2 | suc0 4508 | . 2 ⊢ suc ∅ = {∅} | |
| 3 | 1, 2 | eqtri 2252 | 1 ⊢ 1o = {∅} |
| Colors of variables: wff set class |
| Syntax hints: = wceq 1397 ∅c0 3494 {csn 3669 suc csuc 4462 1oc1o 6575 |
| 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 716 ax-5 1495 ax-7 1496 ax-gen 1497 ax-ie1 1541 ax-ie2 1542 ax-8 1552 ax-10 1553 ax-11 1554 ax-i12 1555 ax-bndl 1557 ax-4 1558 ax-17 1574 ax-i9 1578 ax-ial 1582 ax-i5r 1583 ax-ext 2213 |
| This theorem depends on definitions: df-bi 117 df-tru 1400 df-nf 1509 df-sb 1811 df-clab 2218 df-cleq 2224 df-clel 2227 df-nfc 2363 df-v 2804 df-dif 3202 df-un 3204 df-nul 3495 df-suc 4468 df-1o 6582 |
| This theorem is referenced by: df2o3 6597 df2o2 6598 1n0 6600 el1o 6605 dif1o 6606 ensn1 6970 en1 6973 map1 6987 dom1o 7002 xp1en 7007 exmidpw 7100 exmidpweq 7101 pw1fin 7102 pw1dc0el 7103 exmidpw2en 7104 ss1o0el1o 7105 unfiexmid 7110 0ct 7306 exmidonfinlem 7404 exmidfodomrlemr 7413 exmidfodomrlemrALT 7414 pw1m 7442 pw1on 7444 pw1dom2 7445 pw1ne1 7447 sucpw1nel3 7451 fihashen1 11062 ss1oel2o 16607 pw1ndom3lem 16609 pwle2 16620 pwf1oexmid 16621 sbthom 16651 |
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