 Kant’s critical philosophy of mathematics finds fullest expression in the section of the Critique of Pure Reason entitled “The Discipline of Pure Reason in Dogmatic Use”, which begins the second of the two main divisions of the Critique, the “Transcendental Doctrine of Method.” In previous sections of the Critique, Kant has subjected pure reason “in its transcendental use in accordance with mere concepts” to a critique in order to “constrain its propensity to expansion beyond the narrow boundaries of possible experience” (A711/B739). But Kant tells us that it is unnecessary to subject mathematics to such a critique because the use of pure reason in mathematics is kept to a “visible track” via intuition: “[mathematical] concepts must immediately be exhibited in concreto in pure intuition, through which anything unfounded and arbitrary instantly becomes obvious” (A711/B739). Nevertheless, the practice and discipline of mathematics does require an explanation, in order both to account for its success at demonstrating substantive and necessary truths, and also to license its invocation as a model of reasoning. Kant thus directs himself, as he did in the pre-critical period, to the question of what accounts for the “happy and well grounded” mathematical method, and also of whether it is useful in any discipline other than mathematics. To answer this latter question in the negative, Kant must explain the uniqueness of mathematical reasoning.