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Theorem tbw-negdf 1464
Description: The definition of negation, in terms of and . (Contributed by Anthony Hart, 15-Aug-2011.) (Proof modification is discouraged.) (New usage is discouraged.)
Assertion
Ref Expression
tbw-negdf

Proof of Theorem tbw-negdf
StepHypRef Expression
1 pm2.21 100 . . 3
2 ax-1 6 . . . . 5
3 falim 1328 . . . . 5
42, 3ja 153 . . . 4
54pm2.43i 43 . . 3
61, 5impbii 180 . 2
7 tbw-bijust 1463 . 2
86, 7mpbi 199 1
Colors of variables: wff setvar class
Syntax hints:   wn 3   wi 4   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:  re1luk2  1476  re1luk3  1477
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