Category:Fallacy of Four Terms

This category contains results about Fallacy of Four Terms.
Definitions specific to this category can be found in Definitions/Fallacy of Four Terms.

Consider a categorical syllogism $S$ of the form:

where:

$A$, $B$, $C$ and $D$ are terms of the categorical syllogism

each of $\mathbf \Phi_1$, $\mathbf \Phi_2$ and $\mathbf \Phi_3$ is one of the categorical statements $\mathbf A$, $\mathbf E$, $\mathbf I$ or $\mathbf O$

$x$ and $y$ are each one of $A$, $B$, $C$ and $D$.

Then $S$ commits the fallacy of four terms.