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Fallacy Files: Begging the Question
Discusses the error in logic behind the fallacy of Begging the Question (also known as Circular Argument, Circular Reasoning, Circulus in Probando, Petitio Principii, or Vicious Circle). Although a great deal of information about the...
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Bbc: H2g2 Circular Reasoning
Excellent definition and discussion of the term "Circular Reasoning," including a couple of very clear examples.