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Author Ara, Pere. author Local Multipliers of C*-Algebras [electronic resource] / by Pere Ara, Martin Mathieu London : Springer London : Imprint: Springer, 2003 http://dx.doi.org/10.1007/978-1-4471-0045-4 XII, 319 p. online resource

SUMMARY

Many problems in operator theory lead to the consideration ofoperator equaยญ tions, either directly or via some reformulation. More often than not, howยญ ever, the underlying space is too 'small' to contain solutions of these equaยญ tions and thus it has to be 'enlarged' in some way. The Berberian-Quigley enlargement of a Banach space, which allows one to convert approximate into genuine eigenvectors, serves as a classical example. In the theory of operator algebras, a C*-algebra A that turns out to be small in this sense traditionยญ ally is enlarged to its (universal) enveloping von Neumann algebra A". This works well since von Neumann algebras are in many respects richer and, from the Banach space point of view, A" is nothing other than the second dual space of A. Among the numerous fruitful applications of this principle is the well-known Kadison-Sakai theorem ensuring that every derivation 8 on a C*-algebra A becomes inner in A", though 8 may not be inner in A. The transition from A to A" however is not an algebraic one (and cannot be since it is well known that the property of being a von Neumann algebra cannot be described purely algebraically). Hence, ifthe C*-algebra A is small in an algebraic sense, say simple, it may be inappropriate to move on to A". In such a situation, A is typically enlarged by its multiplier algebra M(A)

CONTENT

1. Prerequisites -- 2. The Symmetric Algebra of Quotients and its Bounded Analogue -- 3. The Centre of the Local Multiplier Algebra -- 4. Automorphisms and Derivations -- 5. Elementary Operators and Completely Bounded Mappings -- 6. Lie Mappings and Related Operators -- References

Mathematics Algebra Functional analysis Operator theory Mathematics Algebra Operator Theory Functional Analysis

Location

Office of Academic Resources, Chulalongkorn University, Phayathai Rd. Pathumwan Bangkok 10330 Thailand