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Theorem df1o2 6294
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 6281 . 2  |-  1o  =  suc  (/)
2 suc0 4303 . 2  |-  suc  (/)  =  { (/)
}
31, 2eqtri 2138 1  |-  1o  =  { (/) }
Colors of variables: wff set class
Syntax hints:    = wceq 1316   (/)c0 3333   {csn 3497   suc csuc 4257   1oc1o 6274
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 588  ax-in2 589  ax-io 683  ax-5 1408  ax-7 1409  ax-gen 1410  ax-ie1 1454  ax-ie2 1455  ax-8 1467  ax-10 1468  ax-11 1469  ax-i12 1470  ax-bndl 1471  ax-4 1472  ax-17 1491  ax-i9 1495  ax-ial 1499  ax-i5r 1500  ax-ext 2099
This theorem depends on definitions:  df-bi 116  df-tru 1319  df-nf 1422  df-sb 1721  df-clab 2104  df-cleq 2110  df-clel 2113  df-nfc 2247  df-v 2662  df-dif 3043  df-un 3045  df-nul 3334  df-suc 4263  df-1o 6281
This theorem is referenced by:  df2o3  6295  df2o2  6296  1n0  6297  el1o  6302  dif1o  6303  ensn1  6658  en1  6661  map1  6674  xp1en  6685  exmidpw  6770  unfiexmid  6774  0ct  6960  exmidonfinlem  7017  exmidfodomrlemr  7026  exmidfodomrlemrALT  7027  fihashen1  10513  ss1oel2o  13116  pw1dom2  13117  pwle2  13120  pwf1oexmid  13121  sbthom  13148
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