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Exclusive Premises

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This page is part of the EvoWiki encyclopedia of fallacies.

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Contents

Synonyms

Explanation

You commit this fallacy if you use only negative syllogisms (i.e. exclusive premises) to draw a conclusion.

  1. No A are B
  2. No C are A
  3. Thus, No C are B.

Example

  1. Plants are not animals.
  2. Humans are not plants.
  3. Therefore, humans are not animals.

This argument is fallacious because both premises are exclusive. If the first premise is a negative syllogism, the other must be a positive: If it was shown that humans are plants, only then would the conclusion be logical.

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Examples in creationist arguments

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