Syllogistic fallacy

Updated on Dec 01, 2023

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

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

References

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