Because of his developments, historians of science Pierre Duhem and Anneliese Maier both saw Buridan as playing an important role in the demise of Aristotelian cosmology. Duhem even called Buridan the forerunner of Galileo. Zupko has disagreed, pointing out that Buridan did not use his theory to transform the science of mechanics, but instead remained a committed Aristotelian in thinking that motion and rest are contrary states and that the universe is finite in extent.