Theorem pm2.46 741

Description: Theorem *2.46 of [WhiteheadRussell] p. 106. (Contributed by NM, 3-Jan-2005.)

Assertion

Ref	Expression
pm2.46	|- ( -. ( ph \/ ps ) -> -. ps )

Proof of Theorem pm2.46

Step	Hyp	Ref	Expression
1		olc 713	. 2 |- ( ps -> ( ph \/ ps ) )
2	1	con3i 633	1 |- ( -. ( ph \/ ps ) -> -. ps )

Syntax hints:   -. wn 3   -> wi 4   \/ wo 710

This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-ia1 106  ax-ia2 107  ax-in1 615  ax-in2 616  ax-io 711

This theorem depends on definitions:  df-bi 117

This theorem is referenced by:  pm2.48  743  pm2.49  744  ioran  754  eueq3dc  2954  regexmidlem1  4599