Like the first Abel Symposium, held in 2004, the Abel Symposium 2015 focused on operator algebras. It is interesting to see the remarkable advances that have been made in operator algebras over these years, which strikingly illustrate the vitality of the field. A total of 26 talks were given at the symposium on a variety of themes, all highlighting the richness of the subject.
The field of operator algebras was created in the 1930s and was motivated by problems of quantum mechanics. It has subsequently developed well beyond its initial intended realm of applications and expanded into such diverse areas of mathematics as representation theory, dynamical systems, differential geometry, number theory and quantum algebra. One branch, known as “noncommutative geometry”, has become a powerful tool for studying phenomena that are beyond the reach of classical analysis.
This volume includes research papers that present new results, surveys that discuss the development of a specific line of research, and articles that offer a combination of survey and research. These contributions provide a multifaceted portrait of beautiful mathematics that both newcomers to the field of operator algebras and seasoned researchers alike will appreciate.
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C*-tensor categories and subfactors for totally disconnected groups: Y. Arano and S. Vaes.- Decomposable approximations revisited: N.P. Brown, J.R. Carrión and S. White.- Exotic crossed products: A. Buss, S. Echterhoff, and R. Willett.- On Hong and Szymanski’s description of the primitive-ideal space of a graph algebra: T. M. Carlsen and A. Sims.- Commutator inequalities via Schur products: E. Christensen.- C*-algebras associated with algebraic actions: J. Cuntz.- A new look at C*-simplicity and the unique trace property of a group: U. Haagerup.- Equilibrium states on graph algebras: A. an Huef and I. Raeburn.- Semigroup C_-algebras: X. Li.- Topological full groups of étale groupoids: H. Matui.- Towards a classification of compact quantum groups of Lie type: S. Neshveyev and M. Yamashita.- A homology theory for Smale spaces: a summary: I.F. Putnam.- On the positive eigenvalues and eigenvectors of a non-negative matrix: K. Thomsen.- Classification of graph algebras: a selective survey: M. Tomforde.- QDQ vs. UCT: W. Winter.
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