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Theorem dfid2 4802
 Description: Alternate definition of the identity relation. (Contributed by NM, 15-Mar-2007.)
Assertion
Ref Expression
dfid2

Proof of Theorem dfid2
StepHypRef Expression
1 dfid3 4801 1
 Colors of variables: wff setvar class Syntax hints:  =wceq 1395  {copab 4509   cid 4795 This theorem is referenced by:  fsplit  6905 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-3an 975  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-rab 2816  df-v 3111  df-dif 3478  df-un 3480  df-in 3482  df-ss 3489  df-nul 3785  df-if 3942  df-sn 4030  df-pr 4032  df-op 4036  df-opab 4511  df-id 4800
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