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Definition df-fal 1311
Description: Definition of  F., a contradiction.  F. is a constant false. (Contributed by Anthony Hart, 22-Oct-2010.)
Assertion
Ref Expression
df-fal  |-  (  F.  <->  -.  T.  )

Detailed syntax breakdown of Definition df-fal
StepHypRef Expression
1 wfal 1308 . 2  wff  F.
2 wtru 1307 . . 3  wff  T.
32wn 3 . 2  wff  -.  T.
41, 3wb 176 1  wff  (  F.  <->  -.  T.  )
Colors of variables: wff set class
This definition is referenced by:  fal  1313  nottru  1338  tnf  24952
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