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Equivariant K-Theory and Freeness of Group Actions on C*-Algebras

by N. Christopher Phillips
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Current price ₹4,625.00
Original price ₹5,550.00
Original price ₹5,550.00
Original price ₹5,550.00
(-17%)
₹4,625.00
Current price ₹4,625.00

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Book cover type: Paperback
  • ISBN13: 9783540182771
  • Binding: Paperback
  • Subject: N/A
  • Publisher: Springer
  • Publisher Imprint: Springer
  • Publication Date:
  • Pages: 374
  • Original Price: GBP 35.99
  • Language: English
  • Edition: 1987
  • Item Weight: 531 grams
  • BISAC Subject(s): Algebra / Linear

Freeness of an action of a compact Lie group on a compact Hausdorff space is equivalent to a simple condition on the corresponding equivariant K-theory. This fact can be regarded as a theorem on actions on a commutative C*-algebra, namely the algebra of continuous complex-valued functions on the space. The successes of "noncommutative topology" suggest that one should try to generalize this result to actions on arbitrary C*-algebras. Lacking an appropriate definition of a free action on a C*-algebra, one is led instead to the study of actions satisfying conditions on equivariant K-theory - in the cases of spaces, simply freeness. The first third of this book is a detailed exposition of equivariant K-theory and KK-theory, assuming only a general knowledge of C*-algebras and some ordinary K-theory. It continues with the author's research on K-theoretic freeness of actions. It is shown that many properties of freeness generalize, while others do not, and that certain forms of K-theoretic freeness are related to other noncommutative measures of freeness, such as the Connes spectrum. The implications of K-theoretic freeness for actions on type I and AF algebras are also examined, and in these cases K-theoretic freeness is characterized analytically.

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