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formal fallacy

Subject Philosophy

DOI: 10.1111/b.9781405106795.2004.x


L ogic Violations of logical rules of inference that result in invalid inference. They can be detected merely by checking the logical form of argument. Formal fallacies are contrasted with informal fallacies, which can only be found through analysis of the content and context of an argument. Each branch of formal logic has many specific formal fallacies; for example, affirming the consequent and denying the antecedent in propositional logic, the undistributed middle term in syllogism, and the illicit quantifier shift in predicate logic. “A formal fallacy is one that may be identified through mere inspection of the form or structure of an argument.” Hurley, A Concise Introduction to Logic ... log in or subscribe to read full text

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