Contents
Preface xi
Chapter 1. Introduction 1
Chapter 2. Designs 11
2.1. Incidence structures 11
2.2. t-Designs 14
2.3. Affine planes 20
2.4. Symmetric designs 26
2.5. Projective geometry 30
Chapter 3. Automorphisms of Designs 37
3.1. Group actions 37
3.2. Automorphisms of symmetric designs 40
Chapter 4. Introducing Difference Sets 45
4.1. Definition and examples 46
4.2. Difference sets and designs 54
4.3. Integral group ring 59
4.4. Equivalence 65
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