Irritable bowel syndrome (IBS), the most common of all digestive disorders, is the leading cause of recurrent abdominal pain. This expanded edition sums up the latest research and offers new information on treatments and on the relationship of anxiety disorders to IBS. The benchmark IBS book, now wi[...]

This book is an exposition of "semi-Riemannian geometry" (also called "pseudo-Riemannian geometry")--the study of a smooth manifold furnished with a metric tensor of arbitrary signature. The principal special cases are Riemannian geometry, where the metric is positive definite, and Lorentz geometry.[...]

This unique monograph examines in detail the mathematics of Kerr black holes, which possess the properties of mass and angular momentum but carry no electrical charge. Suitable for advanced undergraduates and graduate students of mathematics as well as physicists, the self-contained treatment consti[...]