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Theorem mtt 339
Description: Modus-tollens-like theorem. (Contributed by NM, 7-Apr-2001.) (Proof shortened by Wolf Lammen, 12-Nov-2012.)
Assertion
Ref Expression
mtt

Proof of Theorem mtt
StepHypRef Expression
1 biimt 335 . 2
2 con34b 292 . 2
31, 2syl6bbr 263 1
Colors of variables: wff setvar class
Syntax hints:  -.wn 3  ->wi 4  <->wb 184
This theorem is referenced by:  imnot  340  dfnot  1414  fnsuppresOLD  6131  fnsuppres  6946  axpownd  8999  largei  27186
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 185
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