  Kant's scientific writings are also of interest to historians of modern philosophy, historians of science, and historians of philosophy of science. Historians of modern philosophy are especially interested in determining how Kant's views on science might complement or clarify his distinctive metaphysical and epistemological doctrines (e.g., as expressed in the Critique of Pure Reason). Historians of science reflect on the way in which Kant's position fits in with the views of other natural philosophers of the period, such as Newton and Leibniz, including his novel account of the formation of the solar system according to Newtonian principles. Historians of philosophy of science investigate, among other things, Kant's work in the conceptual foundations of physics — in particular, his matter theory (e.g., the infinite divisibility of matter, attractive and repulsive forces, inertia, atoms and the void), his theory of motion, and his dynamical account of the laws of mechanics.