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Theorem pm2.18da 443
Description: Deduction based on reductio ad absurdum. (Contributed by Mario Carneiro, 9-Feb-2017.)
Hypothesis
Ref Expression
pm2.18da.1
Assertion
Ref Expression
pm2.18da

Proof of Theorem pm2.18da
StepHypRef Expression
1 pm2.18da.1 . . 3
21ex 434 . 2
32pm2.18d 111 1
Colors of variables: wff setvar class
Syntax hints:  -.wn 3  ->wi 4  /\wa 369
This theorem is referenced by:  fpwwe2lem13  9041  bpos  23568
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  df-an 371
  Copyright terms: Public domain W3C validator