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This essay attempts a re-reading of the meaning and import of “synthetic propositions a priori” in the light of two other background concepts in Kantian epistemology: Erklärung and Begründung. The significance of this pair of concepts lies in the fact that they represent the “philosophical motive” of Kant---leading him, inevitably, to take the “transcendental turn”. (And, on this point, I believe that some commentators have reversed the dialectic of Kant’s thinking: they make him take the “transcendental turn” first, and then envision the Erklärung and the Begründung.) And the distinction between the “sensible world” and the “intelligible world” was the consequence. Did this distinction also provide the ontological matrix for the epistemological distinction between “analytic propositions” and “synthetic propositions”? I take that to be evident. What is less evident is that Kant was more interested in the relation between the two worlds than in these worlds in isolation. He was concerned with demonstrating the possibility (i.e., the “transcendental possibility” and not merely the “logical possibility”) of the sensible in the light of the intelligible. This he sought to do by elucidating (with the help of “transcendental arguments”) the a priori conditions of possible experience. This was the hidden dialectic of the transformation of the image of mind, from the Lockean “mirror” to the Kantian “prism”. The synthetic propositions a priori (I argue) articulate the relation of the a priori conditions of experience to the possible objects of experience. (That is why Kant takes the metaquestion, “How are synthetic propositions a priori possible?”, to be the main problem of the Kritik der reinen Vemunft.) The significance of the work of Kant for what we moderns call the “philosophy of science” is noted in the conclusion.

Martin offers an intriguing account of nineteenth century challenges to the traditional theory of judgment as a synthesis of subject and predicate (the synthesis theory)--criticisms motivated largely by the problem posed by existential judgments, which need not have two terms at all. Such judgments led to a theory of "thetic" judgments, whose essential feature is to "posit" something, rather than to combine terms (as in synthetic judgment). I argue, however, that Kant's official definition of judgment already implicitly recognizes the importance of positing, and that its (otherwise confusing) abstract generality actually affords Kant's own logic an adequate way to accommodate existential judgments within the traditional synthesis theory. Preservation of a synthetic account of judgment is also found to be independently important for Kant's larger aims in the theory of cognition.

In his Grundlagen , Frege held that geometrical truths.are synthetic a priori , and that they rest on intuition. From this it has been concluded that he thought, like Kant, that space and time are a priori intuitions and that physical objects are mere appearances. It is plausible that Frege always believed geometrical truths to be synthetic a priori ; the virtual disappearance of the word 'intuition' from his writings from after 1885 until 1924 suggests, on the other hand, that he became dissatisfied with the notion of intuition as he had employed it in Grundlagen . The belief that a priori intuition is a source of knowledge does not in itself entail idealism: that is a question about what it is that makes true the propositions known in this way. In Grundlagen , Frege expressly states that geometrical truths are objective in the sense of being independent of our intuition. This shows that, even at that period, Frege did not draw the idealist conclusion drawn by Kant.

It has frequently been suggested that meaning is, in some important sense, normative. However, precisely what is particularly normative about it is often left without any satisfactory explanation, and the ‘normativity thesis’ has thus, justly, been called into question. That said, it will be argued here that the intuition that meaning is ‘normative’ is on the right track, even if many of the purported explanations for meaning’s normativity are not. In particular, rather that being particularly social, the normativity of meaning may follow from the more logical/epistemic relations between use and meaning. Because of this, some use-based theories we still be able to accommodate the normativity of meaning by allowing that while meaning supervenes upon use, the function from use to meaning is a normative one.

If I understand him correctly, Derek Parfit’s views place us, philosophically speaking, in a very small box. According to Parfit, normativity is an irreducible non-natural property that is independent of the human mind. That is to say, there are normative truths - truths about what we ought to do and to want, or about reasons for doing and wanting things. The truths in question are synthetic a priori truths, and accessible to us only by some sort of rational intuition. Parfit supposes that if we are to preserve the irreducibility of the normative, this is just about all we can say, at least until we bring in some actual intuitions to supply the story with some content.

Abstract: My aim is to reconstruct Kant's argument for the principle of the synthetic unity of apperception. I reconstruct Kant's argument in stages, first showing why thinking should be conceived as an activity of synthesis (as opposed to attention), and then showing why the unity or coherence of a subject's representations should depend upon an a priori synthesis. The guiding thread of my account is Kant's conception of enlightenment: as I suggest, the philosophy of mind advanced in the Deduction belongs to an enlightenment epistemology. Kant's conception of enlightenment turns on the requirement that a subject be able to recognize herself as the source of her cognitions. The argument for the apperception principle is reconstructed under the guidance of this conception of the ideal of enlightenment.

In twentieth-century Kant scholarship, few have provided an account of the analytic-synthetic distinction and of the problem of the synthetic a priori that takes into consideration the views of Kant's idealist successors such as Maimon, Fichte, Schelling, and Hegel. I first explain how Kant formulates the analytic-synthetic distinction in terms of the determinate-indeterminate distinction, which, in turn, is based on the distinction between general and transcendental logic. Kant's problem of the synthetic a priori , then, is the problem of showing how the logical forms of judgment can be employed determinately (and not merely indeterminately). I then show that Maimon also formulates the distinction and the problem in the same way, and that his interpretation will shape how Fichte, Schelling, and Hegel each construe and address Kant's question, How are synthetic judgments possible a priori ?

Roderick Chisholm appears to agree with <span class='Hi'>Kant</span> on the question of the existence of synthetic a priori knowledge. But Chisholm’s conception of the a priori is a traditional Aristotelian conception and differs markedly from <span class='Hi'>Kant</span>’s. Closer scrutiny reveals that their agreement on the question of the synthetic a priori is merely verbal: what <span class='Hi'>Kant</span> meant to affirm, Chisholm denies. Curiously, it looks as if Chisholm agreed on all substantive issues with the empiricist rejection of <span class='Hi'>Kant</span>’s synthetic a priori. In the end, it turns out that Chisholm disagrees with empiricism and Kantianism over a fundamental question: whether mere understanding of the contents of our thoughts must always remain within the circle of our own ideas or can provide us with genuine knowledge of matters of fact.

Overview -- Locke's internal sense and Kant's changing views -- Personal identity amd its problems -- Rationalalist metaphysics of mind -- Consciousness, self-consciousness, and cognition -- Strands of Argument in the Duisburg Nachlass -- A transcendental deduction for a priori concepts -- Synthesis : why and how? -- Arguing for apperception -- The power of apperception -- "I-think" as the destroyer of rational psychology -- Is Kant's theory consistent? -- The normativity objection -- Is Kant's thinker (as such) a free and responsible agent? -- Kant our contemporary.