Potential theory

Lester L. Helms (auth.), Lester L. Helms (eds.)9781848823181, 1848823185

Aimed at graduate students and researchers in mathematics, physics, and engineering, this book presents a clear path from calculus to classical potential theory and beyond, moving the reader into a fertile area of mathematical research as quickly as possible. The author revises and updates material from his classic work, Introduction to Potential Theory (1969), to provide a modern text that introduces all the important concepts of classical potential theory.

In the first half of the book, the subject matter is developed meticulously from first principles using only calculus. Commencing with the inverse square law for gravitational and electromagnetic forces and the divergence theorem of the calculus, the author develops methods for constructing solutions of Laplace’s equation on a region with prescribed values on the boundary of the region.

The second half addresses more advanced material aimed at those with a background of a senior undergraduate or beginning graduate course in real analysis. For specialized regions, namely spherical chips, solutions of Laplace’s equation are constructed having prescribed normal derivatives on the flat portion of the boundary and prescribed values on the remaining portion of the boundary. By means of transformations known as diffeomorphisms, these solutions are morphed into local solutions on regions with curved boundaries. The Perron-Weiner-Brelot method is then used to construct global solutions for elliptic partial differential equations involving a mixture of prescribed values of a boundary differential operator on part of the boundary and prescribed values on the remainder of the boundary.

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Table of contents :
Front Matter….Pages i-xi
Preliminaries….Pages 1-6
Laplace’s Equation….Pages 7-52
The Dirichlet Problem….Pages 53-105
Green Functions….Pages 107-147
Negligible Sets….Pages 149-196
Dirichlet Problem for Unbounded Regions….Pages 197-240
Energy….Pages 241-265
Interpolation and Monotonicity….Pages 267-301
Newtonian Potential….Pages 303-331
Elliptic Operators….Pages 333-369
Apriori Bounds….Pages 371-389
Oblique Derivative Problem….Pages 391-429
Back Matter….Pages 431-441