Theorem pm2.76 575

Description: Theorem *2.76 of [WhiteheadRussell] p. 108.

Assertion

Ref	Expression
pm2.76	|- ((ph \/ (ps -> ch)) -> ((ph \/ ps) -> (ph \/ ch)))

Proof of Theorem pm2.76

Step	Hyp	Ref	Expression
1		pm2.75 574	. 2 |- ((ph \/ ps) -> ((ph \/ (ps -> ch)) -> (ph \/ ch)))
2	1	com12 11	1 |- ((ph \/ (ps -> ch)) -> ((ph \/ ps) -> (ph \/ ch)))

Syntax hints:   -> wi 3   \/ wo 222

This theorem is referenced by:  pm2.81 577

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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