Theorem orim2 627

Description: Axiom *1.6 (Sum) of [WhiteheadRussell] p. 97.

Assertion

Ref	Expression
orim2	|- ((ps -> ch) -> ((ph \/ ps) -> (ph \/ ch)))

Proof of Theorem orim2

Step	Hyp	Ref	Expression
1		id 73	. 2 |- ((ps -> ch) -> (ps -> ch))
2	1	orim2d 626	1 |- ((ps -> ch) -> ((ph \/ ps) -> (ph \/ ch)))

Syntax hints:   -> wi 3   \/ wo 239

This theorem is referenced by:  pm2.81 637  naim2 14135  rb-ax1 14219

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 164  df-or 241  df-an 242

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