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The External World Skeptic Argument

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Skepticism argues that we do not know things about the external world. The External World Skeptic argument holds that we cannot, in principle, know things about the external world. Skeptical arguments aim to disprove the Standard Account of Knowledge, which claims that we do in fact know things about the external world. We come to know things through observation and experience, testimony, memory, introspection, and reasoning (Epistemology Lecture Notes). Skeptics claim that all of evidence we have for our knowledge are consistent with alternative hypotheses. The Traditional Account of Knowledge requires a justified, true belief for knowledge. Knowledge requires truth because we can only know things that are true. The factivity of knowledge means that everything we know must be true. Knowledge also calls for belief because you cannot know something you do not accept as true. Finally, knowledge must be justifiable because you need a basis, or evidence, for your true belief to count as knowledge. Skepticism objects the way we come to know things and our knowledge of things by claiming that we do not actually know things about the external world and that our evidence is consistent with alternative skeptical hypotheses.
A skeptical hypothesis aims to show that the world is different externally from how you view it internally. There are many different of skeptical hypotheses, such as the Brain in the Vat Argument, the Cartesian Demon Hypothesis, the Evil Genius Theory, and so on.

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