目录

●Chapter 0. Introduction 5
Chapter 1. Discrete Subgroups of Locally Compact Topological Groups 7
§1. The Simplest Properties of Lattices 7
1.1. Definition of a Discrete Subgroup. Examples 7
1.2. Commensurability and Reducibility of Lattices 10
§2. Discrete Groups of Transformations 12
2.1. Basic Definitions and Examples 12
2.2. Covering Sets and Fu ndamental Domains of a Discrete Group of Transformations 15
§3. Group-Theoretical Properties of Lattices in Lie Groups 17
3.1. Finite Presentability of Lattices 17
3.2. A Theorem of Selberg and Some of Its Consequences 18
3.3. The Property (T) 18
§4. Intersection of Discrete Subgroups with Closed Subgroups 20
4.1. Γ-Closedness of Subgroups 20
4.2. Subgroups with Good Γ-Heredity 22
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