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A prioriA priori knowledge is propositional knowledge that can be had without experience. It is usually contrasted with a posteriori knowledge, which requires experience. Mathematics and logic are usually considered a priori disciplines. The natural and social sciences are usually considered a posteriori disciplines.
He argues that propositions known a priori are necessarily true, while propositions known a posteriori are contingent, because a priori knowledge has always been true, according to Kant. (i.e. A triangle has three sides) A posteriori propositions will depend on external conditions, which may change in time, making the proposition false. (i.e. Jean Chrétien is Canada's Prime Minister)
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