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Introduction to ℓ²-invariants : Mathematics and Statistics (R0) - Holger Kammeyer

Introduction to ℓ²-invariants

By: Holger Kammeyer

eText | 29 October 2019

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This book introduces the reader to the most important concepts and problems in the field of ?²-invariants. After some foundational material on group von Neumann algebras, ?²-Betti numbers are defined and their use is illustrated by several examples. The text continues with Atiyah's question on possible values of ?²-Betti numbers and the relation to Kaplansky's zero divisor conjecture. The general definition of ?²-Betti numbers allows for applications in group theory. A whole chapter is dedicated to Luck's approximation theorem and its generalizations. The final chapter deals with ?²-torsion, twisted variants and the conjectures relating them to torsion growth in homology.

The text provides a self-contained treatment that constructs the required specialized concepts from scratch. It comes with numerous exercises and examples, so that both graduate students and researchers will find it useful for self-study or as a basis for an advanced lecture course.

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Non-FictionMathematicsTopologyAlgebraic TopologyCalculus & Mathematical AnalysisFunctional Analysis & TransformsAlgebraGeometryAnalytic GeometryGroups & Group Theory

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