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Theorem pm4.8 622
Description: Theorem *4.8 of [WhiteheadRussell] p. 122. This one holds for all propositions, but compare with pm4.81dc 813 which requires a decidability condition. (Contributed by NM, 3-Jan-2005.)
Assertion
Ref Expression
pm4.8

Proof of Theorem pm4.8
StepHypRef Expression
1 pm2.01 546 . 2
2 ax-1 5 . 2
31, 2impbii 117 1
Colors of variables: wff set class
Syntax hints:   wn 3   wi 4   wb 98
This theorem was proved from axioms:  ax-1 5  ax-2 6  ax-mp 7  ax-ia2 100  ax-ia3 101  ax-in1 544
This theorem depends on definitions:  df-bi 110
This theorem is referenced by: (None)
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