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Theorem suc0 4389
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 4349 . 2  |-  suc  (/)  =  (
(/)  u.  { (/) } )
2 uncom 3266 . 2  |-  ( (/)  u. 
{ (/) } )  =  ( { (/) }  u.  (/) )
3 un0 3442 . 2  |-  ( {
(/) }  u.  (/) )  =  { (/) }
41, 2, 33eqtri 2190 1  |-  suc  (/)  =  { (/)
}
Colors of variables: wff set class
Syntax hints:    = wceq 1343    u. cun 3114   (/)c0 3409   {csn 3576   suc csuc 4343
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 604  ax-in2 605  ax-io 699  ax-5 1435  ax-7 1436  ax-gen 1437  ax-ie1 1481  ax-ie2 1482  ax-8 1492  ax-10 1493  ax-11 1494  ax-i12 1495  ax-bndl 1497  ax-4 1498  ax-17 1514  ax-i9 1518  ax-ial 1522  ax-i5r 1523  ax-ext 2147
This theorem depends on definitions:  df-bi 116  df-tru 1346  df-nf 1449  df-sb 1751  df-clab 2152  df-cleq 2158  df-clel 2161  df-nfc 2297  df-v 2728  df-dif 3118  df-un 3120  df-nul 3410  df-suc 4349
This theorem is referenced by:  ordtriexmidlem  4496  ordtri2orexmid  4500  2ordpr  4501  onsucsssucexmid  4504  onsucelsucexmid  4507  ordsoexmid  4539  ordtri2or2exmid  4548  ontri2orexmidim  4549  nnregexmid  4598  omsinds  4599  tfr0dm  6290  df1o2  6397  nninfsellemdc  13890
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