Skepticism About the A Priori Justification: Self-Evidence, Defeasibiity, and Cogito Propositions

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This article focuses on the cogito propositions and those propositions whose classification as a priori is disputed. It explains that a priori justification is commonly taken to be a kind of justification is based on reason rather than on experience and evaluates the skeptical view that no genuinely substantive proposition is a priori and that reason has far less power to reveal truth than has been supposed by a great many philosophers. It also discusses the domain of the a priori, empiricist skepticism about the a priori, and the case for a priori existential knowledge.

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