Plane Waves and Spherical Means Applied to Partial Differential Equations

John (Institute of Mathematical Sciences, New York University) presents results on partial differential equations, showing how a variety of results on fairly general differential equations follow from certain elementary identities for plan and spherical integrals of an arbitrary function. He demonstrates that integrals over ordinary spheres and planes can be used to advantage, even for equations unrelated to the ordinary Euclidean metric. This is an unabridged republication of the edition published by Interscience Publishers, Inc., New York, 1955. Annotation ©2004 Book News, Inc., Portland, OR