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Theorem pm5.6 878
Description: Conjunction in antecedent versus disjunction in consequent. Theorem *5.6 of [WhiteheadRussell] p. 125. (Contributed by NM, 8-Jun-1994.)
Assertion
Ref Expression
pm5.6

Proof of Theorem pm5.6
StepHypRef Expression
1 impexp 433 . 2
2 df-or 359 . . 3
32imbi2i 303 . 2
41, 3bitr4i 243 1
Colors of variables: wff setvar class
Syntax hints:   wn 3   wi 4   wb 176   wo 357   wa 358
This theorem was proved from axioms:  ax-1 5  ax-2 6  ax-3 7  ax-mp 8
This theorem depends on definitions:  df-bi 177  df-or 359  df-an 360
This theorem is referenced by:  ssundif  3633
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