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Theorem pm5.501 341
Description: Theorem *5.501 of [WhiteheadRussell] p. 125. (Contributed by NM, 3-Jan-2005.)
Assertion
Ref Expression
pm5.501

Proof of Theorem pm5.501
StepHypRef Expression
1 pm5.1im 238 . 2
2 bi1 186 . . 3
32com12 31 . 2
41, 3impbid 191 1
Colors of variables: wff setvar class
Syntax hints:  ->wi 4  <->wb 184
This theorem is referenced by:  ibib  342  ibibr  343  nbn2  345  pm5.18  356  biass  359  pm5.1  857  sadadd2lem2  14100  isclo  19588  nrmmetd  21095  bj-bibibi  34175
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
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