Theorem pm2.3 339

Description: Theorem *2.3 of [WhiteheadRussell] p. 104.

Assertion

Ref	Expression
pm2.3	|- ((ph \/ (ps \/ ch)) -> (ph \/ (ch \/ ps)))

Proof of Theorem pm2.3

Step	Hyp	Ref	Expression
1		pm1.4 247	. 2 |- ((ps \/ ch) -> (ch \/ ps))
2	1	orim2i 338	1 |- ((ph \/ (ps \/ ch)) -> (ph \/ (ch \/ ps)))

Syntax hints:   -> wi 3   \/ wo 222

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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