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Theorem pm5.501 330
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 229 . 2
2 bi1 178 . . 3
32com12 27 . 2
41, 3impbid 183 1
Colors of variables: wff setvar class
Syntax hints:   wi 4   wb 176
This theorem was proved from axioms:  ax-1 5  ax-2 6  ax-3 7  ax-mp 8
This theorem depends on definitions:  df-bi 177
This theorem is referenced by:  ibib  331  ibibr  332  nbn2  334  pm5.18  345  biass  348  pm5.1  830
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