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    Abstract: The contemporary discussion of radical skepticism – the category of skepticism that defends the thesis that knowledge is impossible – is presented in two different arguments: skeptical arguments of epistemic closure (AFE) and epistemic underdetermination (ASE). We intend to describe how the skeptical paradox is constructed. Then, how the two classes of argument are related to the principles of underdetermination and epistemic closure. Finally, we will present the logical argument which…Read more