In his exposition, The Main Concepts and Ideas of Fluid Dynamics in their Historical Development, Neményi was highly critical of Isaac Newton's inadequate understanding of fluid dynamics. I. Bernard Cohen argues that Neményi pays insufficient attention to Newton's empirical experiments. However, Cohen notes that Neményi provides the "most thorough and incisive analyses in print of Newton's work on fluids, written by an obvious master of science. For example, Neményi is the only author I have encountered who has shown the weakness of Newton's "proof" at the end of Book 2, that vortices contradict the laws of astronomy.