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Theorem notatnand 41994
Description: Do not use. Use intnanr instead. Given not a, there exists a proof for not (a and b). (Contributed by Jarvin Udandy, 31-Aug-2016.)
Ref Expression
notatnand.1 ¬ 𝜑
Ref Expression
notatnand ¬ (𝜑𝜓)

Proof of Theorem notatnand
StepHypRef Expression
1 notatnand.1 . 2 ¬ 𝜑
21intnanr 483 1 ¬ (𝜑𝜓)
Colors of variables: wff setvar class
Syntax hints:  ¬ wn 3  wa 386
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 199  df-an 387
This theorem is referenced by:  dandysum2p2e4  42096
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