Theorem pm4.63 421

Description: Theorem *4.63 of [WhiteheadRussell] p. 120. (Contributed by NM, 3-Jan-2005.)

Assertion

Ref	Expression
pm4.63

Proof of Theorem pm4.63

Step	Hyp	Ref	Expression
1		df-an 371	. 2
2	1	bicomi 202	1

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

This theorem is referenced by:  pm4.67  428  nqereu  9328  axacprim  29079  andnand1  29864

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-an 371