Ergodic Theoretic Methods in Group Homology

Name: Ergodic Theoretic Methods in Group Homology
Brand: Springer, Berlin
SKU: 9783030442194
Price: 359.29 RON
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A Minicourse on L2-Betti Numbers in Group Theory

Autor: Clara Löh

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Editura: Springer, Berlin

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This book offers a concise introduction to ergodic methods in group homology, with a particular focu...

Informații despre carte

Autor

Clara Löh

Limbă

engleză

Legare

Carte - Carte broșată

Publicat

2020

Pagini

114

EAN

9783030442194

Enbook ID

28195020

Editura

Springer, Berlin

Greutate

203

Dimensiuni

166 x 241 x 8

Descriere completă

This book offers a concise introduction to ergodic methods in group homology, with a particular focus on the computation of L 2 -Betti numbers. Group homology integrates group actions into homological structure. Coefficients based on probability measure preserving actions combine ergodic theory and homology. An example of such an interaction is provided by L 2 -Betti numbers: these invariants can be understood in terms of group homology with coefficients related to the group von Neumann algebra, via approximation by finite index subgroups, or via dynamical systems. In this way, L 2 -Betti numbers lead to orbit/measure equivalence invariants and measured group theory helps to compute L 2 -Betti numbers. Similar methods apply also to compute the rank gradient/cost of groups as well as the simplicial volume of manifolds. This book introduces L 2 -Betti numbers of groups at an elementary level and then develops the ergodic point of view, emphasising the connection with approximation phenomena for homological gradient invariants of groups and spaces. The text is an extended version of the lecture notes for a minicourse at the MSRI summer graduate school "Random and arithmetic structures in topology" and thus accessible to the graduate or advanced undergraduate students. Many examples and exercises illustrate the material.

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Ergodic Theoretic Methods in Group Homology

A Minicourse on L2-Betti Numbers in Group Theory

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Descriere completă

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