# Partial Differential Equations

• Jürgen Jost
Book

Part of the Graduate Texts in Mathematics book series (GTM, volume 214)

1. Front Matter
Pages i-xi
2. Pages 31-50
3. Pages 127-156
4. Pages 193-242
5. Pages 243-254
6. Back Matter
Pages 309-325

### Introduction

This textbook is intended for students who wish to obtain an introduction to the theory of partial di?erential equations (PDEs, for short), in particular, those of elliptic type. Thus, it does not o?er a comprehensive overview of the whole ?eld of PDEs, but tries to lead the reader to the most important methods and central results in the case of elliptic PDEs. The guiding qu- tion is how one can ?nd a solution of such a PDE. Such a solution will, of course, depend on given constraints and, in turn, if the constraints are of the appropriate type, be uniquely determined by them. We shall pursue a number of strategies for ?nding a solution of a PDE; they can be informally characterized as follows: (0) Write down an explicit formula for the solution in terms of the given data (constraints). This may seem like the best and most natural approach, but this is possible only in rather particular and special cases. Also, such a formula may be rather complicated, so that it is not very helpful for detecting qualitative properties of a solution. Therefore, mathematical analysis has developed other, more powerful, approaches. (1) Solve a sequence of auxiliary problems that approximate the given one, and show that their solutions converge to a solution of that original pr- lem. Di?erential equations are posed in spaces of functions, and those spaces are of in?nite dimension.

### Keywords

Maximum PDE Partial Differential Equations Sobolev space calculus differential equation hyperbolic equation maximum principle partial differential equation wave equation

#### Authors and affiliations

• Jürgen Jost
• 1
1. 1.Max-Planck-Institut für Mathematik in den NaturwissenschaftenLeipzigGermany

### Bibliographic information

• DOI https://doi.org/10.1007/b97312
• Copyright Information Springer-Verlag New York, Inc. 2002
• Publisher Name Springer, New York, NY
• eBook Packages
• Print ISBN 978-0-387-95428-8
• Online ISBN 978-0-387-21595-2
• Series Print ISSN 0072-5285