""Four Lectures on Mathematics"" is a book written by Jacques Hadamard, a renowned French mathematician. The book was first published in 1915 and contains four lectures that Hadamard delivered at Columbia University in New York. The lectures cover a range of topics in mathematics, including the theory of functions, the calculus of variations, and the theory of partial differential equations. Hadamard also discusses the role of mathematics in physics and the applications of mathematics in other fields.The book is written in a clear and concise style, making it accessible to both students and professionals in the field of mathematics. Hadamard's lectures are full of insights and examples that illustrate the concepts he presents.Overall, ""Four Lectures on Mathematics"" is a valuable resource for anyone interested in mathematics, whether they are a student, a researcher, or simply someone who enjoys learning about the subject. Hadamard's lectures are timeless and continue to be relevant to this day.This scarce antiquarian book is a facsimile reprint of the old original and may contain some imperfections such as library marks and notations. Because we believe this work is culturally important, we have made it available as part of our commitment for protecting, preserving, and promoting the world's literature in affordable, high quality, modern editions, that are true to their original work.