Hardcover ISBN:  9780821813928 
Product Code:  GSM/37 
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Electronic ISBN:  9781470420895 
Product Code:  GSM/37.E 
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Book DetailsGraduate Studies in MathematicsVolume: 37; 2001; 531 ppMSC: Primary 30; 11; 14;
There are incredibly rich connections between classical analysis and number theory. For instance, analytic number theory contains many examples of asymptotic expressions derived from estimates for analytic functions, such as in the proof of the Prime Number Theorem. In combinatorial number theory, exact formulas for numbertheoretic quantities are derived from relations between analytic functions. Elliptic functions, especially theta functions, are an important class of such functions in this context, which had been made clear already in Jacobi's Fundamenta nova. Theta functions are also classically connected with Riemann surfaces and with the modular group \(\Gamma = \mathrm{PSL}(2,\mathbb{Z})\), which provide another path for insights into number theory.
Farkas and Kra, wellknown masters of the theory of Riemann surfaces and the analysis of theta functions, uncover here interesting combinatorial identities by means of the function theory on Riemann surfaces related to the principal congruence subgroups \(\Gamma(k)\). For instance, the authors use this approach to derive congruences discovered by Ramanujan for the partition function, with the main ingredient being the construction of the same function in more than one way. The authors also obtain a variant on Jacobi's famous result on the number of ways that an integer can be represented as a sum of four squares, replacing the squares by triangular numbers and, in the process, obtaining a cleaner result.
The recent trend of applying the ideas and methods of algebraic geometry to the study of theta functions and number theory has resulted in great advances in the area. However, the authors choose to stay with the classical point of view. As a result, their statements and proofs are very concrete. In this book the mathematician familiar with the algebraic geometry approach to theta functions and number theory will find many interesting ideas as well as detailed explanations and derivations of new and old results.
Highlights of the book include systematic studies of theta constant identities, uniformizations of surfaces represented by subgroups of the modular group, partition identities, and Fourier coefficients of automorphic functions.
Prerequisites are a solid understanding of complex analysis, some familiarity with Riemann surfaces, Fuchsian groups, and elliptic functions, and an interest in number theory. The book contains summaries of some of the required material, particularly for theta functions and theta constants.
Readers will find here a careful exposition of a classical point of view of analysis and number theory. Presented are numerous examples plus suggestions for researchlevel problems. The text is suitable for a graduate course or for independent reading.ReadershipGraduate students, research mathematicians interested in complex analysis and number theory.

Table of Contents

Chapters

Chapter 1. The modular group and elliptic function theory

Chapter 2. Theta functions with characteristics

Chapter 3. Function theory for the modular group $\Gamma $ and its subgroups

Chapter 4. Theta constant identities

Chapter 5. Partition theory: Ramanujan congruences

Chapter 6. Identities related to partition functions

Chapter 7. Combinatorial and number theoretic applications


Reviews

Can be useful to experts and novices alike, … details are abundant and developments mainly selfcontained, … the book can be read with profit by anyone with a sufficient background in complex analysis, … Farkas and Kra have exposed a great deal of beautiful mathematics, all of it solidly grounded in the classics of our tradition, and yet much of it new. … this elevates their work to a model of exposition … that could be emulated to the benefit of the entire mathematical community.
Mathematical Reviews


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There are incredibly rich connections between classical analysis and number theory. For instance, analytic number theory contains many examples of asymptotic expressions derived from estimates for analytic functions, such as in the proof of the Prime Number Theorem. In combinatorial number theory, exact formulas for numbertheoretic quantities are derived from relations between analytic functions. Elliptic functions, especially theta functions, are an important class of such functions in this context, which had been made clear already in Jacobi's Fundamenta nova. Theta functions are also classically connected with Riemann surfaces and with the modular group \(\Gamma = \mathrm{PSL}(2,\mathbb{Z})\), which provide another path for insights into number theory.
Farkas and Kra, wellknown masters of the theory of Riemann surfaces and the analysis of theta functions, uncover here interesting combinatorial identities by means of the function theory on Riemann surfaces related to the principal congruence subgroups \(\Gamma(k)\). For instance, the authors use this approach to derive congruences discovered by Ramanujan for the partition function, with the main ingredient being the construction of the same function in more than one way. The authors also obtain a variant on Jacobi's famous result on the number of ways that an integer can be represented as a sum of four squares, replacing the squares by triangular numbers and, in the process, obtaining a cleaner result.
The recent trend of applying the ideas and methods of algebraic geometry to the study of theta functions and number theory has resulted in great advances in the area. However, the authors choose to stay with the classical point of view. As a result, their statements and proofs are very concrete. In this book the mathematician familiar with the algebraic geometry approach to theta functions and number theory will find many interesting ideas as well as detailed explanations and derivations of new and old results.
Highlights of the book include systematic studies of theta constant identities, uniformizations of surfaces represented by subgroups of the modular group, partition identities, and Fourier coefficients of automorphic functions.
Prerequisites are a solid understanding of complex analysis, some familiarity with Riemann surfaces, Fuchsian groups, and elliptic functions, and an interest in number theory. The book contains summaries of some of the required material, particularly for theta functions and theta constants.
Readers will find here a careful exposition of a classical point of view of analysis and number theory. Presented are numerous examples plus suggestions for researchlevel problems. The text is suitable for a graduate course or for independent reading.
Graduate students, research mathematicians interested in complex analysis and number theory.

Chapters

Chapter 1. The modular group and elliptic function theory

Chapter 2. Theta functions with characteristics

Chapter 3. Function theory for the modular group $\Gamma $ and its subgroups

Chapter 4. Theta constant identities

Chapter 5. Partition theory: Ramanujan congruences

Chapter 6. Identities related to partition functions

Chapter 7. Combinatorial and number theoretic applications

Can be useful to experts and novices alike, … details are abundant and developments mainly selfcontained, … the book can be read with profit by anyone with a sufficient background in complex analysis, … Farkas and Kra have exposed a great deal of beautiful mathematics, all of it solidly grounded in the classics of our tradition, and yet much of it new. … this elevates their work to a model of exposition … that could be emulated to the benefit of the entire mathematical community.
Mathematical Reviews