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Theorem nsyl4 161
Description: A negated syllogism inference. (Contributed by NM, 15-Feb-1996.)
Hypotheses
Ref Expression
nsyl4.1 (𝜑𝜓)
nsyl4.2 𝜑𝜒)
Assertion
Ref Expression
nsyl4 𝜒𝜓)

Proof of Theorem nsyl4
StepHypRef Expression
1 nsyl4.2 . . 3 𝜑𝜒)
21con1i 149 . 2 𝜒𝜑)
3 nsyl4.1 . 2 (𝜑𝜓)
42, 3syl 17 1 𝜒𝜓)
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:  nsyl5  162  pm2.61i  185  axc7  2325  nfunsn  6682  mptrcl  6754  card2on  9002  carden2a  9379  ax10fromc7  36188  axc5c711  36211  axc5c711to11  36214  naecoms-o  36220  axc5c4c711  41100  axc5c4c711to11  41104  afvco2  43727
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