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formal fallacy

noun
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Definition of formal fallacy

: a violation of any rule of formal inference

— called also paralogism

—contrasted with material fallacy and verbal fallacy — compare affirmation of the consequent, denial of the antecedent, ignoratio elenchi, illicit process, petitio principii

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“Formal fallacy.” The Merriam-Webster.com Dictionary, Merriam-Webster Inc., https://www.merriam-webster.com/dictionary/formal%20fallacy. Accessed 14 December 2019.

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