Theorem pm4.62 235

Description: Theorem *4.62 of [WhiteheadRussell] p. 120.

Assertion

Ref	Expression
pm4.62	|- ((ph -> -. ps) <-> (-. ph \/ -. ps))

Proof of Theorem pm4.62

Step	Hyp	Ref	Expression
1		imor 234	1 |- ((ph -> -. ps) <-> (-. ph \/ -. ps))

Syntax hints:  -. wn 2   -> wi 3   <-> wb 146   \/ wo 222

This theorem is referenced by:  anor 304  pm5.16 667

This theorem was proved from axioms:  ax-1 4  ax-2 5  ax-3 6  ax-mp 7

This theorem depends on definitions:  df-bi 147  df-or 224

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