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

Step	Hyp	Ref	Expression
1		id 22	. 2
2	1	impd 431	1

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