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Theorem ssab 3555
 Description: Subclass of a class abstraction. (Contributed by NM, 16-Aug-2006.)
Assertion
Ref Expression
ssab
Distinct variable group:   ,
Allowed substitution hint:   ()

Proof of Theorem ssab
StepHypRef Expression
1 abid2 2583 . . 3
21sseq1i 3513 . 2
3 ss2ab 3553 . 2
42, 3bitr3i 251 1
 Colors of variables: wff setvar class Syntax hints:   wi 4   wb 184  wal 1381   wcel 1804  cab 2428   wss 3461 This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-3 8  ax-gen 1605  ax-4 1618  ax-5 1691  ax-6 1734  ax-7 1776  ax-10 1823  ax-11 1828  ax-12 1840  ax-13 1985  ax-ext 2421 This theorem depends on definitions:  df-bi 185  df-or 370  df-an 371  df-tru 1386  df-ex 1600  df-nf 1604  df-sb 1727  df-clab 2429  df-cleq 2435  df-clel 2438  df-nfc 2593  df-in 3468  df-ss 3475 This theorem is referenced by:  ssabral  3556  ssrab  3563  wdomd  8010  ixpiunwdom  8020  lidldvgen  17882  prdsxmslem2  21010  ballotlem2  28405
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