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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 6306 | . 2 ⊢ 1o = suc ∅ | |
2 | suc0 4328 | . 2 ⊢ suc ∅ = {∅} | |
3 | 1, 2 | eqtri 2158 | 1 ⊢ 1o = {∅} |
Colors of variables: wff set class |
Syntax hints: = wceq 1331 ∅c0 3358 {csn 3522 suc csuc 4282 1oc1o 6299 |
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 603 ax-in2 604 ax-io 698 ax-5 1423 ax-7 1424 ax-gen 1425 ax-ie1 1469 ax-ie2 1470 ax-8 1482 ax-10 1483 ax-11 1484 ax-i12 1485 ax-bndl 1486 ax-4 1487 ax-17 1506 ax-i9 1510 ax-ial 1514 ax-i5r 1515 ax-ext 2119 |
This theorem depends on definitions: df-bi 116 df-tru 1334 df-nf 1437 df-sb 1736 df-clab 2124 df-cleq 2130 df-clel 2133 df-nfc 2268 df-v 2683 df-dif 3068 df-un 3070 df-nul 3359 df-suc 4288 df-1o 6306 |
This theorem is referenced by: df2o3 6320 df2o2 6321 1n0 6322 el1o 6327 dif1o 6328 ensn1 6683 en1 6686 map1 6699 xp1en 6710 exmidpw 6795 unfiexmid 6799 0ct 6985 exmidonfinlem 7042 exmidfodomrlemr 7051 exmidfodomrlemrALT 7052 fihashen1 10538 ss1oel2o 13178 pw1dom2 13179 pwle2 13182 pwf1oexmid 13183 sbthom 13210 |
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