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Theorem pm4.15 564
Description: Theorem *4.15 of [WhiteheadRussell] p. 117. (Contributed by NM, 3-Jan-2005.) (Proof shortened by Wolf Lammen, 18-Nov-2012.)
Assertion
Ref Expression
pm4.15

Proof of Theorem pm4.15
StepHypRef Expression
1 con2b 324 . 2
2 nan 563 . 2
31, 2bitr2i 241 1
Colors of variables: wff setvar class
Syntax hints:   wn 3   wi 4   wb 176   wa 358
This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-3 8
This theorem depends on definitions:  df-bi 177  df-an 360
This theorem is referenced by: (None)
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