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Hilbert $C\sp*$-modules. A toolkit for operator algebraists. (English) Zbl 0822.46080
London Mathematical Society Lecture Note Series. 210. Cambridge: Univ. Press,. ix, 130 p. £ 17.95; $ 29.95 (1995).
The aim of these Lecture Notes, considered by the author as a toolkit for operator algebraists, is to provide students and non specialists mathematicians, for the first time, a very clear and unified exposition of the main techniques and results that have shown themselves to be useful in a variety of contents in modern $C\sp*$-algebra theory and some of its major applications. These techniques and results centre round the concept of Hilbert $C\sp*$-module, an object like Hilbert space provided that the inner product takes its value in a general $C\sp*$-algebra instead of being complex-valued. Hilbert $C\sp*$-modules first appeared in the work of I. Kaplansky in 1953 on modules over operator algebras. The book is divided in ten chapters and contains a very selective list of references. The first three chapters present basic definitions and concepts and the elementary theory of Hilbert $C\sp*$-modules in the model of classical Hilbert spaces. Chapter 4 presents tensor products. Chapter 5 is a treatment on completely-positive mappings between $C\sp*$-algebras and then in the context of Hilbert $C\sp*$-algebras. In the chapter 6, a universal positive response is given, under some countability condition on modules, to the following general question: Given a $C\sp*$-algebra $A$, can we hope to classify all Hilbert-$A$-modules up to unitary equivalence? Broadly, chapters 4 to 6 are motivated by applications of Hilbert $C\sp*$-modules to the $K$-theory and $KK$-theory. Chapter 7 is a short interlude on the topic of Morita equivalence, chapter 8 on slice maps and bialgebras, chapter 9 on unbounded operators and chapter 10 on the bounded transform and unbounded multipliers, are oriented towards application to $C\sp*$-algebraic quantum group theory, but quantum groups as such do not figure in this book.

46L89Other “noncommutative” mathematics based on $C^*$-algebra theory
46-01Textbooks (functional analysis)
46H25Normed modules and Banach modules, topological modules
46L05General theory of $C^*$-algebras