Although the “Transcendental Aesthetic” is the briefest part of the first Critique, it has garnered a lion's share of discussion. This fact reflects the important implications that Kant drew from his arguments there. He used the arguments concerning space and time to display examples of synthetic a priori cognition, to secure his division between intuitions and concepts, and to support transcendental idealism. Earlier, in the years around 1770, Kant's investigations into space and time had facilitated his turn toward “critical” philosophy. (...) Prior to that time, Kant's main interests in space and time pertained to physics and metaphysics. As he entered the critical period, he delved into the cognitive basis of our experience of space (and time), and drew his conclusions about their ideality. Kant's doctrines of space and time provoked extensive response in his own time and throughout the nineteenth century. These responses variously concerned the metaphysics, physics, epistemology, psychology, and geometry of space. Throughout the nineteenth century, philosophers, physiologists, and psychologists sought to extend or to refute Kant's theories of space. By the last decades of the nineteenth century, many had rightly concluded that the existence of non-Euclidean geometry as a candidate description of physical space refuted Kant's full doctrine of space - though some have hoped that his position might be saved by restricting it to “visual space.”. (shrink)

Although Kant argues that a world republic with coercive public law is the only rational way to secure a lawful cosmopolitan condition, he states that it is an unachievable ideal, and he proposes a voluntary, non-coercive federation of states as a substitute. While some scholars have criticized Kant for moving away from this ideal due merely to pragmatic considerations, I argue that his rejection of a coercive world republic is based on his conception of state sovereignty and what is required (...) for a lawful condition. I consider how we can institutionalize a lawful condition between states without a coercive world republic in ways that go beyond Kant’s voluntary federation. I also consider how we can resolve this dilemma in Kant’s account to support a federal world republic. (Published online first on June 16, 2014). (shrink)