Theorem pm4.45 640

Description: Theorem *4.45 of [WhiteheadRussell] p. 119.

Assertion

Ref	Expression
pm4.45	|- (ph <-> (ph /\ (ph \/ ps)))

Proof of Theorem pm4.45

Step	Hyp	Ref	Expression
1		orc 269	. 2 |- (ph -> (ph \/ ps))
2	1	pm4.71i 637	1 |- (ph <-> (ph /\ (ph \/ ps)))

Syntax hints:   <-> wb 146   \/ wo 222   /\ wa 223

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  df-an 225

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