Theorem pm2.45 277

Description: Theorem *2.45 of [WhiteheadRussell] p. 106.

Assertion

Ref	Expression
pm2.45	|- (-. (ph \/ ps) -> -. ph)

Proof of Theorem pm2.45

Step	Hyp	Ref	Expression
1		orc 269	. 2 |- (ph -> (ph \/ ps))
2	1	con3i 98	1 |- (-. (ph \/ ps) -> -. ph)

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

This theorem is referenced by:  pm2.47 279  eueq3 1916  sspr 2472

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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