Syllogism Rules I-III | Syllogism rules IV-VII |
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There must be 4 and only 4 terms in a syllogism
What does Rule I say?
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The middle term must be distributed at least once
What does Rule IV say?
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The middle term must not appear in the conclusion
What does Rule II say?
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If two premises are affirmative, the conclusion must also be affirmative.
What does rule VI say?
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If a term is distributed in the conclusion then it must be distributed in the premises
What does Rule III say?
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If either premise is negative, the conclusion must be negative
What does Rule VII say?
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The fallacy of equivocation and the fallacy of four terms
What are the two fallacies of rule I?
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No conclusion can follow from 2 negative premises
What does rule V say?
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The fallacy of illicit major and the fallacy of illicit minor
What are the two fallacies associated with Rule III?
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Rules V-VII
Which rule numbers are the qualitative rules?
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