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Mackey 2-functors And Mackey 2-motives. by Paul Balmer, Ivo Dell'Ambrogio is a nonfiction available to read on EtoBox.

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This book is dedicated to equivariant mathematics, specifically the study of additive categories of objects with actions of finite groups. The framework of Mackey 2-functors axiomatizes the variance of such categories as a function of the group. In other words, it provides a categorification of the widely used notion of Mackey functor, familiar to representation theorists and topologists. The book contains an extended catalogue of examples of such Mackey 2-functors that are already in use in many mathematical fields from algebra to topology, from geometry to KK-theory. Among the first results of the theory, the ambidexterity theorem gives a way to construct further examples and the separable monadicity theorem explains how the value of a Mackey 2-functor at a subgroup can be carved out of the value at a larger group, by a construction that generalizes ordinary localization in the same way that the étale topology generalizes the Zariski topology. The second part of the book provides a motivic approach to Mackey 2-functors, 2-categorifying the well-known span construction of Dress and Lindner. This motivic theory culminates with the following application: The idempotents of Yoshida’s

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Author

Paul Balmer, Ivo Dell'Ambrogio

Publisher

European Mathematical Society Publishing House

Published

2020

Language

EN

ISBN

9783037192092

Category

nonfiction

Subjects

Mathematics, Stem