
This article is cited in 4 scientific papers (total in 4 papers)
Equivariant analogues of the Euler characteristic and Macdonald type equations
S. M. GuseinZade^{} ^{} Moscow State University
Abstract:
One of the simplest and, at the same time, most important invariants of a topological space is the Euler characteristic. A generalization of the notion of the Euler characteristic to the equivariant setting, that is, to spaces with an action of a group (say, finite) is far from unique. An equivariant analogue of the Euler characteristic can be defined as an element of the ring of representations of the group or as an element of the Burnside ring of the group. From physics came the notion of the orbifold Euler characteristic, and this was generalized to orbifold Euler characteristics of higher orders. The main property of the Euler characteristic (defined in terms of the cohomology with compact support) is its additivity. On some classes of spaces there are additive invariants other than the Euler characteristic, and they can be regarded as generalized Euler characteristics. For example, the class of a variety in the Grothendieck ring of complex quasiprojective varieties is a universal additive invariant on the class of complex quasiprojective varieties. Generalized analogues of the Euler characteristic can also be defined in the equivariant setting. There is a simple formula — the Macdonald equation — for the generating series of the Euler characteristics of the symmetric powers of a space: it is equal to the series $(1t)^{1}=1+t+t^2+\cdots$ independent of the space, raised to a power equal to the Euler characteristic of the space itself. Equations of a similar kind for other invariants (‘equivariant and generalized Euler characteristics’) are called Macdonald type equations. This survey discusses different versions of the Euler characteristic in the equivariant setting and describes some of their properties and Macdonald type equations.
Bibliography: 59 titles.
Keywords:
finite group actions, equivariant Euler characteristic, orbifold Euler characteristic.
Funding Agency 
Grant Number 
Russian Science Foundation 
161110018 
This work was supported by the Russian Science Foundation under grant 161110018. 
DOI:
https://doi.org/10.4213/rm9748
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English version:
Russian Mathematical Surveys, 2017, 72:1, 1–32
Bibliographic databases:
UDC:
515.171.5+515.165
MSC: Primary 57S17, 57R20; Secondary 32M99, 32Q55 Received: 16.10.2016 Revised: 13.12.2016
Citation:
S. M. GuseinZade, “Equivariant analogues of the Euler characteristic and Macdonald type equations”, Uspekhi Mat. Nauk, 72:1(433) (2017), 3–36; Russian Math. Surveys, 72:1 (2017), 1–32
Citation in format AMSBIB
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