Syllogistic fallacy

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Syllogistic fallacies are formal fallacies that occur in syllogisms. They include or :

Any syllogism type (other than polysyllogism and disjunctive):

• fallacy of four terms

Occurring in categorical syllogisms:

• related to affirmative or negative premises:
  • affirmative conclusion from a negative premise
  • fallacy of exclusive premises
  • negative conclusion from affirmative premises
• existential fallacy
• fallacy of the undistributed middle
• illicit major
• illicit minor
• fallacy of necessity

Occurring in disjunctive syllogisms:

• affirming a disjunct

Occurring in statistical syllogisms (dicto simpliciter fallacies):

• accident
• converse accident

See also[]

• Argumentation theory
• Syllogism § Syllogistic fallacies

External links[]

• Fallacy files: Syllogistic fallacy
• Online Syllogistic Machine An interactive syllogistic machine for exploring all the fallacies, figures, terms, and modes of syllogisms.

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