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Theorem 2false 604
Description: Two falsehoods are equivalent. (Contributed by NM, 4-Apr-2005.) (Revised by Mario Carneiro, 31-Jan-2015.)
Hypotheses
Ref Expression
2false.1
2false.2
Assertion
Ref Expression
2false

Proof of Theorem 2false
StepHypRef Expression
1 2false.1 . . 3
21pm2.21i 562 . 2
3 2false.2 . . 3
43pm2.21i 562 . 2
52, 4impbii 117 1
Colors of variables: wff set class
Syntax hints:   wn 3   wb 98
This theorem was proved from axioms:  ax-1 5  ax-2 6  ax-mp 7  ax-ia2 100  ax-ia3 101  ax-in2 533
This theorem depends on definitions:  df-bi 110
This theorem is referenced by:  bianfi  842  bifal  1241  dfnul2  3203  dfnul3  3204  rab0  3223  iun0  3687  0iun  3688  0xp  4347  cnv0  4654  co02  4761  0er  6051  bdnth  7061  bdnthALT  7062
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