| Syllogistic Fallacies | The fallacies in this section are all cases of invalid categorical syllogisms. |
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| Readers not familiar with categorical syllogisms should consult Stephen's Guide to Categorical Syllogisms. | |
| The following are syllogistic fallacies: | |
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[Fallacy of Four Terms: a syllogism has four terms ]
[Undistributed Middle: two separate categories are said to be connected because they share a common property ] [Illicit Major: the predicate of the conclusion talks about all of something, but the premises only mention some cases of the term in the predicate ] ["Illicit Minor: the subject of the conclusion talks about all of something, but the premises only mention some cases of the term in the subject ] [Fallacy of Exclusive Premises: a syllogism has two negative premises ] [Fallacy of Drawing an Affirmative Conclusion From a Negative Premise: as the name implies ] [Existential Fallacy: a particular conclusion is drawn from universal premises] | |