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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 6313 | . 2 ⊢ 1o = suc ∅ | |
2 | suc0 4333 | . 2 ⊢ suc ∅ = {∅} | |
3 | 1, 2 | eqtri 2160 | 1 ⊢ 1o = {∅} |
Colors of variables: wff set class |
Syntax hints: = wceq 1331 ∅c0 3363 {csn 3527 suc csuc 4287 1oc1o 6306 |
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 2121 |
This theorem depends on definitions: df-bi 116 df-tru 1334 df-nf 1437 df-sb 1736 df-clab 2126 df-cleq 2132 df-clel 2135 df-nfc 2270 df-v 2688 df-dif 3073 df-un 3075 df-nul 3364 df-suc 4293 df-1o 6313 |
This theorem is referenced by: df2o3 6327 df2o2 6328 1n0 6329 el1o 6334 dif1o 6335 ensn1 6690 en1 6693 map1 6706 xp1en 6717 exmidpw 6802 unfiexmid 6806 0ct 6992 exmidonfinlem 7049 exmidfodomrlemr 7058 exmidfodomrlemrALT 7059 fihashen1 10545 ss1oel2o 13189 pw1dom2 13190 pwle2 13193 pwf1oexmid 13194 sbthom 13221 |
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