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5 Categorical Syllogisms

5 Categorical Syllogisms. 5.3 Rules and Fallacies. Categorical Syllogisms. There are 5 rules for and 5 corresponding fallacies that beset categorical syllogisms. They are: The middle term must be distributed at least once ( fallacy: Undistributed Middle ) All Tacos are Messy things

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5 Categorical Syllogisms

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  1. 5 Categorical Syllogisms 5.3 Rules and Fallacies

  2. Categorical Syllogisms There are 5 rules for and 5 corresponding fallacies that beset categorical syllogisms. They are: • The middle term must be distributed at least once (fallacy: Undistributed Middle) All Tacos are Messy things All Sandwiches are Messy things All Sandwiches are Tacos All Messy things are Fun All Tacos are Messy things All Tacos are Fun • If a term is distributed in the conclusion, it must be distributed in a premise (fallacies: illicit major or illicit minor) • Two negative premises are not allowed (fallacy: Exclusive premises) • A negative premise requires a negative conclusion, and a negative conclusion requires a negative premise (fallacies: Drawing an affirmative conclusion from a negative premise or Drawing a negative conclusion from affirmative premises) • If both premises are universal, the conclusion cannot be particular (fallacy: existential fallacy) T T S F M M

  3. Testing Syllogisms by Rule Construct these syllogisms and test: IAI-2 EIO-1 IEO-1 EOO-4 AII-3 AAI-4

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