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Theorem pm2.01d 161
Description: Deduction based on reductio ad absurdum. (Contributed by NM, 18-Aug-1993.) (Proof shortened by Wolf Lammen, 5-Mar-2013.)
Hypothesis
Ref Expression
pm2.01d.1
Assertion
Ref Expression
pm2.01d

Proof of Theorem pm2.01d
StepHypRef Expression
1 pm2.01d.1 . 2
2 id 19 . 2
31, 2pm2.61d1 151 1
Colors of variables: wff setvar class
Syntax hints:   wn 3   wi 4
This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-3 8
This theorem is referenced by:  pm2.65d  166  pm2.01da  429
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