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Theorem pm3.31 445
Description: Theorem *3.31 (Imp) of [WhiteheadRussell] p. 112. (Contributed by NM, 3-Jan-2005.) (Proof shortened by Wolf Lammen, 24-Mar-2013.)
Assertion
Ref Expression
pm3.31

Proof of Theorem pm3.31
StepHypRef Expression
1 id 22 . 2
21impd 431 1
Colors of variables: wff setvar class
Syntax hints:  ->wi 4  /\wa 369
This theorem is referenced by:  impexp  446  imp5a  598  issref  5385  stoweidlem17  31799  trsbc  33311  3impexpVD  33656  trsbcVD  33677  19.41rgVD  33702
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
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