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Theorem intnanrd 879
Description: Introduction of conjunct inside of a contradiction. (Contributed by NM, 10-Jul-2005.)
Hypothesis
Ref Expression
intnand.1 (𝜑 → ¬ 𝜓)
Assertion
Ref Expression
intnanrd (𝜑 → ¬ (𝜓𝜒))

Proof of Theorem intnanrd
StepHypRef Expression
1 intnand.1 . 2 (𝜑 → ¬ 𝜓)
2 simpl 107 . 2 ((𝜓𝜒) → 𝜓)
31, 2nsyl 593 1 (𝜑 → ¬ (𝜓𝜒))
Colors of variables: wff set class
Syntax hints:  ¬ wn 3  wi 4  wa 102
This theorem was proved from axioms:  ax-1 5  ax-2 6  ax-mp 7  ax-ia1 104  ax-in1 579  ax-in2 580
This theorem is referenced by:  dcan  880  bianfd  894  frecabcl  6146  frecsuclem  6153  xrrebnd  9250  fzpreddisj  9452  iseqf1olemqk  9888  gcdsupex  11031  gcdsupcl  11032  nndvdslegcd  11039  divgcdnn  11048  sqgcd  11100  coprm  11205
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