Fallacy of Undistributed Middle
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Fallacy
By Middle Term of Valid Categorical Syllogism is Distributed at least Once, the middle term of a valid categorical syllogism is distributed in at least one of the premises.
To express a syllogism where this rule is violated is to commit the fallacy of the undistributed middle.
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Sources
- 1965: E.J. Lemmon: Beginning Logic ... (previous) ... (next): Chapter $4$: The Predicate Calculus $2$: $4$ The Syllogism: Exercises: $\text{A}$: Rules of Quantity: $2$: Footnote