Combinatorial Number Theory and Additive Group Theory

  • Alfred Geroldinger
  • Imre Z. Ruzsa

Part of the Advanced Courses in Mathematics - CRM Barcelona book series (ACMBIRK)

Table of contents

  1. Front Matter
    Pages i-xi
  2. Additive Group Theory and Non-unique Factorizations

  3. Sumsets and Structure

    1. Front Matter
      Pages 87-87
    2. Pages 89-90
    3. Pages 91-91
    4. Pages 141-165
    5. Pages 167-184
    6. Pages 185-197
    7. Pages 199-210
  4. Thematic seminars

    1. Front Matter
      Pages 211-211
    2. Yahya O. Hamidoune
      Pages 241-252
    3. Norbert Hegyvári
      Pages 253-265
    4. Melvyn B. Nathanson
      Pages 279-297
    5. Jozsef Solymosi
      Pages 299-314
    6. Yonutz V. Stanchescu
      Pages 315-330

About this book


This book collects the material delivered in the 2008 edition of the DocCourse in Combinatorics and Geometry which was devoted to the topic of additive combinatorics. The first two parts, which form the bulk of the volume, contain the two main advanced courses, Additive Group Theory and Non-Unique Factorizations by Alfred Geroldinger, and Sumsets and Structure by Imre Z. Ruzsa.

The first part centers on the interaction between non-unique factorization theory and additive group theory. The main objective of factorization theory is a systematic treatment of phenomena related to the non-uniqueness of factorizations in monoids and domains. This part introduces basic concepts of factorization theory such as sets of lengths, and outlines the translation of arithmetical questions in Krull monoids into combinatorial questions on zero-sum sequences over the class group. Using methods from additive group theory such as the theorems of Kneser and of Kemperman-Scherk, classical zero-sum constants are studied, including the Davenport constant and the Erdös-Ginzburg-Ziv constant. Finally these results are applied again to the starting arithmetical problems.

The second part is a course on the basics of combinatorial number theory (or additive combinatorics): cardinality inequalities (Plünnecke’s graph theoretical method), Freiman’s theorem on the structure of sets with a small sumset, inequalities for the Schnirelmann and asymptotic density of sumsets, analogous results for the measure of sumsets of reals, the connection with the Bohr topology.

The third part of the volume collects some of the seminars which accompanied the main courses. It contains contributions by C. Elsholtz, G. Freiman, Y. O. Hamidoune, N. Hegyvari, G. Karolyi, M. Nathanson, J. Solymosi and Y. Stanchescu.


Graph Graph theory Group theory additive group theory combinatorial number theory factorization number theory sumsets

Authors and affiliations

  • Alfred Geroldinger
    • 1
  • Imre Z. Ruzsa
    • 2
  1. 1.Institute for Mathematics and Scientific ComputingUniversity of GrazGrazAustria
  2. 2.Alfréd Rényi Institute of MathematicsBudapestHungary

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