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L-Functions

An Elementary Introduction

  • Textbook
  • © 2025

Overview

  • Gives a complete presentation of Tate's thesis with concrete number-theoretical applications
  • Minimal prerequisites: no prior knowledge of representation theory or algebraic geometry is assumed
  • Provides an accessible introduction to Artin L-functions and their algebraic and analytic properties

Part of the book series: UNITEXT (UNITEXT, volume 171)

Part of the book sub series: La Matematica per il 3+2 (UNITEXTMAT)

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About this book

This book provides an accessible introduction to the theory of L-functions, emphasising their central role in number theory and their direct applications to key results. Designed to be elementary, it offers readers a clear pathway into the subject, starting from minimal background. It describes several important classes of L-functions — Riemann and Dedekind zeta functions, Dirichlet L-functions, and Hecke L-functions (for characters with finite image) — by showing how they are all special cases of the construction, due to Artin, of the L-function of a Galois representation. The analytic properties of abelian L-functions are presented in detail, including the full content of Tate's thesis, which establishes analytic continuation and functional equations via harmonic analysis. General Hecke L-functions are also discussed, using the modern perspective of idèles and adèles to connect their analytic theory with the representation-theoretic approach of Artin's L-functions. A distinguishing feature of this book is its accessibility: while largely avoiding arithmetic geometry, it provides introductions to both algebraic number theory and key aspects of representation theory. This approach ensures that the material is accessible to both beginning graduate students and advanced undergraduates. Applications play a central role throughout, highlighting how L-functions underpin significant results in number theory. The book provides complete proofs of the prime number theorem, Dirichlet's theorem on primes in arithmetic progressions, Chebotarev's density theorem, and the analytic class number formula, demonstrating the power of the theory in solving classical problems. It serves as an ideal introduction for advanced undergraduates and beginning graduate students and can also be a useful reference for preparing a course on the subject.

Keywords

Table of contents (16 chapters)

  1. Classical L-functions and Applications

  2. Prerequisites for Tate’s Thesis

  3. Tate’s Thesis

Authors and Affiliations

  • Dipartimento di Matematica, Università di Pisa, Pisa, Italy

    Davide Lombardo

About the author

Davide Lombardo is a number theorist based at the University of Pisa, Italy. He studied at the Scuola Normale Superiore (Italy) and the Université Paris-Saclay (France), and obtained his PhD from the latter in 2016. After a short post-doctoral position in Hannover (Germany), he joined the Department of Mathematics in Pisa in 2017, first as a researcher and then – since 2022 – as an associate professor. His work focuses mainly on the geometric and arithmetic interplay between Galois representations and abelian varieties. L-functions are a fundamental tool in this area, providing a bridge between arithmetic and analytic objects.

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Bibliographic Information

  • Book Title: L-Functions

  • Book Subtitle: An Elementary Introduction

  • Authors: Davide Lombardo

  • Series Title: UNITEXT

  • DOI: https://doi.org/10.1007/978-3-031-85145-2

  • Publisher: Springer Cham

  • eBook Packages: Mathematics and Statistics, Mathematics and Statistics (R0)

  • Copyright Information: The Editor(s) (if applicable) and The Author(s), under exclusive license to Springer Nature Switzerland AG 2025

  • Softcover ISBN: 978-3-031-85144-5Published: 27 April 2025

  • eBook ISBN: 978-3-031-85145-2Published: 26 April 2025

  • Series ISSN: 2038-5714

  • Series E-ISSN: 2532-3318

  • Edition Number: 1

  • Number of Pages: XIV, 261

  • Number of Illustrations: 3 b/w illustrations, 1 illustrations in colour

  • Topics: Number Theory

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