Philosophiæ Naturalis Principia Mathematica
Grünbaum, who acknowledges his debts to the philosopher Hans Reichenbach, discusses the philosophy of space and time, and scientific and mathematical fields such as geometry, chronometry, and geochronometry. He also provides an account of the "Philosophiæ Naturalis Principia Mathematica" (1687) of the physicist Isaac Newton, as well as the work of other physicists such as Albert Einstein, and that of the mathematician Bernhard Riemann. He criticizes the philosophers Ernest Nagel and Jacques Maritain, arguing that in "The Structure of Science" (1961) Nagel misinterprets the philosopher of science Henri Poincaré and that in "The Degrees of Knowledge" (1932) Maritain misinterprets the nature of geometry.