Some Applications of Modular Forms

An account of unexpected applications of number theory to practical questions that arise in mathematics and computer science.

Peter Sarnak (Author)

9780521067706, Cambridge University Press

Paperback / softback, published 10 July 2008

124 pages, 7 b/w illus.
22.9 x 15.2 x 0.7 cm, 0.19 kg

Review of the hardback: '… fascinating book …' Monatshefte für Mathematik

The theory of modular forms and especially the so-called 'Ramanujan Conjectures' have been applied to resolve problems in combinatorics, computer science, analysis and number theory. This tract, based on the Wittemore Lectures given at Yale University, is concerned with describing some of these applications. In order to keep the presentation reasonably self-contained, Professor Sarnak begins by developing the necessary background material in modular forms. He then considers the solution of three problems: the Ruziewicz problem concerning finitely additive rotationally invariant measures on the sphere; the explicit construction of highly connected but sparse graphs: 'expander graphs' and 'Ramanujan graphs'; and the Linnik problem concerning the distribution of integers that represent a given large integer as a sum of three squares. These applications are carried out in detail. The book therefore should be accessible to a wide audience of graduate students and researchers in mathematics and computer science.

Introduction
1. Modular forms
2. Invariant means on L?(Sn)
3. Ramanujan graphs
4. Bounds for Fourier coefficients of 1/2-integral weight
Bibliogrpahy
Index.

Subject Areas: Algebra [PBF]