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Theorem df1o2 6596
Description: Expanded value of the ordinal number 1. (Contributed by NM, 4-Nov-2002.)
Assertion
Ref Expression
df1o2 1o = {∅}

Proof of Theorem df1o2
StepHypRef Expression
1 df-1o 6582 . 2 1o = suc ∅
2 suc0 4508 . 2 suc ∅ = {∅}
31, 2eqtri 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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