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Theorem pm4.82 856
Description: Theorem *4.82 of [WhiteheadRussell] p. 122. (Contributed by NM, 3-Jan-2005.)
Assertion
Ref Expression
pm4.82

Proof of Theorem pm4.82
StepHypRef Expression
1 pm2.65 584 . . 3
21imp 115 . 2
3 pm2.21 547 . . 3
4 pm2.21 547 . . 3
53, 4jca 290 . 2
62, 5impbii 117 1
Colors of variables: wff set class
Syntax hints:   wn 3   wi 4   wa 97   wb 98
This theorem was proved from axioms:  ax-1 5  ax-2 6  ax-mp 7  ax-ia1 99  ax-ia2 100  ax-ia3 101  ax-in1 544  ax-in2 545
This theorem depends on definitions:  df-bi 110
This theorem is referenced by: (None)
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