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Theorem pm5.63 924
Description: Theorem *5.63 of [WhiteheadRussell] p. 125. (Contributed by NM, 3-Jan-2005.) (Proof shortened by Wolf Lammen, 25-Dec-2012.)
Assertion
Ref Expression
pm5.63

Proof of Theorem pm5.63
StepHypRef Expression
1 exmid 415 . . 3
2 ordi 864 . . 3
31, 2mpbiran 918 . 2
43bicomi 202 1
Colors of variables: wff setvar class
Syntax hints:  -.wn 3  <->wb 184  \/wo 368  /\wa 369
This theorem is referenced by:  jaoi2  968  cad1  1465  plydivex  22693  lineunray  29797
This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-3 8
This theorem depends on definitions:  df-bi 185  df-or 370  df-an 371
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