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Traditionally, a justification for believing something is a priori is if, and only if, it is independent of experience. Throughout Western philosophy since Plato, some of the most divisive questions have been whether a priori justification exists, how it is possible, and how far it reaches. This book is structured around these three main questions. The first question has recently been modulated as to concern the significance of a priori justification: given the unclarities and presuppositio...