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In classical rhetoric and logic, begging the question or assuming the conclusion (Latin: petitio principii) is an informal fallacy that occurs when an argument's premises assume the truth of the conclusion, instead of supporting it.
- "Green is the best color because it is the greenest of all colors"
This statement claims that the color green is the best because it is the greenest – which it presupposes is the best.
It is a type of circular reasoning: an argument that requires that the desired conclusion be true. This often occurs in an indirect way such that the fallacy's presence is hidden, or at least not easily apparent.