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Theorem pm5.15 859
Description: Theorem *5.15 of [WhiteheadRussell] p. 124. (Contributed by NM, 3-Jan-2005.) (Proof shortened by Wolf Lammen, 15-Oct-2013.)
Assertion
Ref Expression
pm5.15

Proof of Theorem pm5.15
StepHypRef Expression
1 xor3 346 . . 3
21biimpi 186 . 2
32orri 365 1
Colors of variables: wff setvar class
Syntax hints:   wn 3   wb 176   wo 357
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
This theorem is referenced by:  sbc2or  3054
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