  TD has two sides, though Kant never treats them separately. He once called them the objective and the subjective deductions (Axvii). The objective deduction is about the conceptual and other cognitive conditions of having representations of objects. It is Kant’s answer to the quid juris question. Exactly how the objective deduction goes is highly controversial, a controversy that we will sidestep here. The subjective deduction is about what the mind, the “subjective sources” of understanding (A97), must as a consequence be like. The subjective deduction is what mainly interests us.