The third thing in synthetic judgment a priori in Kant's Philosophy

n Kant's point of view, we need a third thing as a mediating between predicate and subject in synthetic judgments. This issue about synthetic judgment a priori is a puzzle, because this judgment is not empirical and we can not use empirical intuition as a mediate thing in it. So, the third thing in this case must be pure and a priori. It's pure intuition of time. Time in imagination has two functions; first, when it combine pure concepts and empirical intuitions and second, when it make synthetic judgment a priori possible. In this paper I want justify this matter