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Theorem bifal 1327
Description: A contradiction is equivalent to falsehood. (Contributed by Mario Carneiro, 9-May-2015.)
Hypothesis
Ref Expression
bifal.1
Assertion
Ref Expression
bifal

Proof of Theorem bifal
StepHypRef Expression
1 bifal.1 . 2
2 fal 1322 . 2
31, 22false 339 1
Colors of variables: wff setvar class
Syntax hints:   wn 3   wb 176   wfal 1317
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-tru 1319  df-fal 1320
This theorem is referenced by:  truanfal  1337  falantru  1338  trubifal  1351  spfalwOLD  1699
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