# 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**.

## Sources

- 1965: E.J. Lemmon:
*Beginning Logic*... (previous) ... (next): $\S 4.4$: The Syllogism: Exercises: $\text{A}$: Rules of Quantity: $2$: Footnote