How Does Descartes Use Doubt

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a. Descartes uses doubt as a method to build a solid foundation for knowledge. He claims that he must reject any fundamental assumption or belief about which he is not absolutely certain; he must doubt a proposition if and only if the best evidence for p is compatible with falsity. We may sometimes find that our senses deceive us; for example, we might see a straight stick appear bent when placed in a glass of water. Therefore, any sense or belief informed by sense is cast into doubt. Descartes then argues it is possible to doubt all perception. For example, I have sensations when I am awake, but I often have sensations when I am dreaming. When I am dreaming, the sensations seem the same as when I am awake. So whenever I have sensations,
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