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Theorem brun 4692
Description: The union of two binary relations. (Contributed by NM, 21-Dec-2008.)
Assertion
Ref Expression
brun

Proof of Theorem brun
StepHypRef Expression
1 elun 3220 . 2
2 df-br 4640 . 2
3 df-br 4640 . . 3
4 df-br 4640 . . 3
53, 4orbi12i 507 . 2
61, 2, 53bitr4i 268 1
Colors of variables: wff setvar class
Syntax hints:   wb 176   wo 357   wcel 1710   cun 3207  cop 4561   class class class wbr 4639
This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-3 8  ax-gen 1546  ax-5 1557  ax-17 1616  ax-9 1654  ax-8 1675  ax-6 1729  ax-7 1734  ax-11 1746  ax-12 1925  ax-ext 2334
This theorem depends on definitions:  df-bi 177  df-or 359  df-an 360  df-nan 1288  df-tru 1319  df-ex 1542  df-nf 1545  df-sb 1649  df-clab 2340  df-cleq 2346  df-clel 2349  df-nfc 2478  df-v 2861  df-nin 3211  df-compl 3212  df-un 3214  df-br 4640
This theorem is referenced by:  dmun  4912  cnvun  5033  coundi  5082  coundir  5083  nchoicelem16  6304
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