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Theorem suc0 4537
Description: The successor of the empty set. (Contributed by NM, 1-Feb-2005.)
Assertion
Ref Expression
suc0  |-  suc  (/)  =  { (/)
}

Proof of Theorem suc0
StepHypRef Expression
1 df-suc 4497 . 2  |-  suc  (/)  =  (
(/)  u.  { (/) } )
2 uncom 3367 . 2  |-  ( (/)  u. 
{ (/) } )  =  ( { (/) }  u.  (/) )
3 un0 3546 . 2  |-  ( {
(/) }  u.  (/) )  =  { (/) }
41, 2, 33eqtri 2259 1  |-  suc  (/)  =  { (/)
}
Colors of variables: wff set class
Syntax hints:    = wceq 1398    u. cun 3212   (/)c0 3512   {csn 3694   suc csuc 4491
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 717  ax-5 1496  ax-7 1497  ax-gen 1498  ax-ie1 1542  ax-ie2 1543  ax-8 1553  ax-10 1554  ax-11 1555  ax-i12 1556  ax-bndl 1558  ax-4 1559  ax-17 1575  ax-i9 1579  ax-ial 1583  ax-i5r 1584  ax-ext 2216
This theorem depends on definitions:  df-bi 117  df-tru 1401  df-nf 1510  df-sb 1812  df-clab 2221  df-cleq 2227  df-clel 2230  df-nfc 2375  df-v 2817  df-dif 3216  df-un 3218  df-nul 3513  df-suc 4497
This theorem is referenced by:  ordtriexmidlem  4646  ordtri2orexmid  4650  2ordpr  4651  onsucsssucexmid  4654  onsucelsucexmid  4657  ordsoexmid  4689  ordtri2or2exmid  4698  ontri2orexmidim  4699  nnregexmid  4748  omsinds  4749  tfr0dm  6566  df1o2  6674  nninfsellemdc  16914
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