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Theorem ssab 3569
Description: Subclass of a class abstraction. (Contributed by NM, 16-Aug-2006.)
Assertion
Ref Expression
ssab
Distinct variable group:   ,

Proof of Theorem ssab
StepHypRef Expression
1 abid2 2597 . . 3
21sseq1i 3527 . 2
3 ss2ab 3567 . 2
42, 3bitr3i 251 1
Colors of variables: wff setvar class
Syntax hints:  ->wi 4  <->wb 184  A.wal 1393  e.wcel 1818  {cab 2442  C_wss 3475
This theorem is referenced by:  ssabral  3570  ssrab  3577  wdomd  8028  ixpiunwdom  8038  lidldvgen  17903  prdsxmslem2  21032  ballotlem2  28427
This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-3 8  ax-gen 1618  ax-4 1631  ax-5 1704  ax-6 1747  ax-7 1790  ax-10 1837  ax-11 1842  ax-12 1854  ax-13 1999  ax-ext 2435
This theorem depends on definitions:  df-bi 185  df-or 370  df-an 371  df-tru 1398  df-ex 1613  df-nf 1617  df-sb 1740  df-clab 2443  df-cleq 2449  df-clel 2452  df-nfc 2607  df-in 3482  df-ss 3489
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