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Logical Fallacies
      Part 1
Hasty Generalization
A conclusion based on insufficient or
    unrepresentative evidence




                  QuickTimeª and a
                    decompressor
          are needed to see this picture.
Faulty Use of Authority

              QuickTimeª and a
                decompressor
       are needed to see this picture.
Post Hoc
   The arguer infers that because one event
follows another event, the first event must be
                  the cause.



                          QuickTimeª and a
                            decompressor
                   are needed to see this picture.
False Analogy
    Many analogies are merely descriptive
and offer no proof of the connection between
        the two things being compared.



                     QuickTimeª and a
                       decompressor
              are needed to see this picture.
Ad Hominem

         QuickTimeª and a
           decompressor
  are needed to see this picture.
False Dilemma
Also known as the either/or fallacy.



                  QuickTimeª and a
                    decompressor
          are needed to see this picture.
Slippery Slope
     If an arguer predicts that taking a first step will
            lead inevitably to a second, usually
        undesirable step and provides no evidence.
Legalization of abortion will lead to murder of the old and
          the physically and mentally handicapped.
Famous Commercial
     Example
            QuickTimeª and a
              decompressor
     are needed to see this picture.

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Logical fallacies

  • 2. Hasty Generalization A conclusion based on insufficient or unrepresentative evidence QuickTimeª and a decompressor are needed to see this picture.
  • 3. Faulty Use of Authority QuickTimeª and a decompressor are needed to see this picture.
  • 4. Post Hoc The arguer infers that because one event follows another event, the first event must be the cause. QuickTimeª and a decompressor are needed to see this picture.
  • 5. False Analogy Many analogies are merely descriptive and offer no proof of the connection between the two things being compared. QuickTimeª and a decompressor are needed to see this picture.
  • 6. Ad Hominem QuickTimeª and a decompressor are needed to see this picture.
  • 7. False Dilemma Also known as the either/or fallacy. QuickTimeª and a decompressor are needed to see this picture.
  • 8. Slippery Slope If an arguer predicts that taking a first step will lead inevitably to a second, usually undesirable step and provides no evidence. Legalization of abortion will lead to murder of the old and the physically and mentally handicapped.
  • 9. Famous Commercial Example QuickTimeª and a decompressor are needed to see this picture.