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Idempotent Matrices over Complex Group Algebras (Paperback, 2006 ed.)
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Idempotent Matrices over Complex Group Algebras (Paperback, 2006 ed.)
Series: Universitext
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The study of idempotent elements in group algebras (or, more
generally, the study of classes in the K-theory of such algebras)
originates from geometric and analytic considerations. For example,
C.T.C. Wall [72] has shown that the problem of deciding whether a
?nitely dominated space with fundamental group? is homotopy
equivalent to a ?nite CW-complex leads naturally to the study of a
certain class in the reduced K-theoryK (Z?) of the group ringZ?. 0
As another example, consider a discrete groupG which acts freely,
properly discontinuously, cocompactly and isometrically on a
Riemannian manifold. Then, following A. Connes and H. Moscovici
[16], the index of an invariant 0th-order elliptic
pseudo-di?erential operator is de?ned as an element in the ? ? K
-group of the reduced groupC -algebraCG. 0 r
Theidempotentconjecture(alsoknownasthegeneralizedKadisonconjec- ? ?
ture) asserts that the reduced groupC -algebraCG of a discrete
torsion-free r groupG has no idempotents =0,1; this claim is known
to be a consequence of a far-reaching conjecture of P. Baum and A.
Connes [6]. Alternatively, one
mayapproachtheidempotentconjectureasanassertionabouttheconnect-
ness of a non-commutative space;ifG is a discrete torsion-free
abelian group ? thenCG is the algebra of continuous complex-valued
functions on the dual r
General
Imprint: |
Springer-Verlag
|
Country of origin: |
Germany |
Series: |
Universitext |
Release date: |
October 2005 |
First published: |
2006 |
Authors: |
Ioannis Emmanouil
|
Dimensions: |
235 x 155 x 15mm (L x W x T) |
Format: |
Paperback
|
Pages: |
282 |
Edition: |
2006 ed. |
ISBN-13: |
978-3-540-27990-7 |
Categories: |
Books >
Science & Mathematics >
Mathematics >
Algebra >
General
|
LSN: |
3-540-27990-3 |
Barcode: |
9783540279907 |
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