Theorem pm4.83 929

Description: Theorem *4.83 of [WhiteheadRussell] p. 122. (Contributed by NM, 3-Jan-2005.)

Assertion

Ref	Expression
pm4.83

Proof of Theorem pm4.83

Step	Hyp	Ref	Expression
1		exmid 415	. . 3
2	1	a1bi 337	. 2
3		jaob 783	. 2
4	2, 3	bitr2i 250	1

Syntax hints:  -.wn 3  ->wi 4  <->wb 184  \/wo 368  /\wa 369

This theorem is referenced by:  dmdbr5ati  27341  cvlsupr3  35069  rp-fakeanorass  37737

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