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Theorem sbcorgOLD 3373
 Description: Distribution of class substitution over disjunction. (Contributed by NM, 21-May-2004.) Obsolete as of 17-Aug-2018. Use sbcor 3372 instead. (New usage is discouraged.) (Proof modification is discouraged.)
Assertion
Ref Expression
sbcorgOLD

Proof of Theorem sbcorgOLD
Dummy variable is distinct from all other variables.
StepHypRef Expression
1 dfsbcq2 3330 . 2
2 dfsbcq2 3330 . . 3
3 dfsbcq2 3330 . . 3
42, 3orbi12d 709 . 2
5 sbor 2139 . 2
61, 4, 5vtoclbg 3168 1
 Colors of variables: wff setvar class Syntax hints:  ->wi 4  <->wb 184  \/wo 368  =wceq 1395  [wsb 1739  e.wcel 1818  [.wsbc 3327 This theorem is referenced by:  sbc3orgOLD  33303  sbc3orgVD  33651 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-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-v 3111  df-sbc 3328
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