Theorem pm2.63 430

Description: Theorem *2.63 of [WhiteheadRussell] p. 107.

Assertion

Ref	Expression
pm2.63	|- ((ph \/ ps) -> ((-. ph \/ ps) -> ps))

Proof of Theorem pm2.63

Step	Hyp	Ref	Expression
1		pm2.53 254	. 2 |- ((ph \/ ps) -> (-. ph -> ps))
2		idd 61	. 2 |- ((ph \/ ps) -> (ps -> ps))
3	1, 2	jaod 426	1 |- ((ph \/ ps) -> ((-. ph \/ ps) -> ps))

Syntax hints:  -. wn 2   -> 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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