In logic, a fallacy is when an argument is used as decisive of a particular issue, which in reality it does not decide. Properly a fallacy is a fault in the form of reasoning, but the term is applied also to faults in the substance of the argument such as the petitio principii, or proving one proposition by assuming another which is identical with it; ignoratio elenchi, or mistaking the point at issue; post hocergo propter hoc, or arguing as if sequence were the same thing as cause and effect. Research Fallacy
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