Laurent Series

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103 pages

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English

This is the fifth textbook you can download containing examples from the Theory of Complex Functions.

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Om forfatteren

*Leif Mejlbro* was educated as a mathematician at the *University of Copenhagen*, where he wrote his thesis on *Linear Partial Differential Operators and Distributions*. Shortly after he obtained a position at the *Technical University of Denmark*, where he remained until h...

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This is the fifth textbook you can download containing examples from the Theory of Complex Functions. In this volume we shall consider the Laurent series and their relationship to the general theory, and finally the technique of solving linear differential equations with polynomial coefficients by means of Laurent series.

This book requires knowledge of Calculus 1 and Calculus 2.

This is the fifth book containing examples from the *Theory of Complex Functions*. In this volume we shall consider the Laurent series, which are, roughly speaking, complex power series in which we also allow negative exponents. We shall only consider the the series and their relationship to the general theory, and finally the technique of solving linear differential equations with polynomial coefficients by means of Laurent series. The importance of these Laurent series will be shown in the following books, where we first introduce the residues in the sixth book, and then examples of applications in the seventh book. Thus these three books, the present one and the two following, form together make up an important part of the *Theory of Complex Functions*.

Even if I have tried to be careful about this text, it is impossible to avoid errors, in particular in the first edition. It is my hope that the reader will show some understanding of my situation.

Leif Mejlbro

12th June 2008

- Some theoretical background
- Laurent series
- Fourier series
- Laurent series solution of dierential equations
- Isolated boundary points
- The conditions around the point at 8