ABSTRACT
A priori knowledge might at least look special. If it is a kind of knowledge that includes justification that does not involve having one, rather than another, specific experience of the world, then a priori knowledge apparently involves justification that comes from something other than experience. A priori knowledge is a special kind of knowledge directed at a special kind of truth — truths that are not about a world that is knowable only by being experienced. Is the difference between a priori knowledge and a posteriori knowledge that simple, though? May be TAP is false. Saul Kripke is the philosopher who has most famously questioned TAP He reasons as follows. May be there are some necessary truths that can be known only by way of experience. Maybe some contingent truths can be known without drawing on experience.
