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Syllogism question

  1. Dec 18, 2008 #1
    I was wondering if anyone could show me why a syllogism of the form oai-3 is invalid.

    Thanks :smile:
  2. jcsd
  3. Dec 18, 2008 #2


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    I was hoping someone else would answer this because I have no idea what "oai-3" means!
  4. Dec 18, 2008 #3
    These are the initials of the famous Aristotelean syllogisms:

    A; All S is P

    E : No S is P

    I : Some S is P

    O : Some S is not P

    Now an OAI-3 IS combination out of the 600 something ,not all of course valid

    I think Deadalus1 must not make his question deadalodic and give us the syllogism
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