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 International Book Series of Mathematical Texts 2012; 148 pp; hardcover ISBN-10: 973-87899-8-2 ISBN-13: 978-973-87899-8-2 List Price: US$36 Member Price: US$28.80 Order Code: THETA/16 This volume contains the proceedings of the 23rd International Conference on Operator Theory, held in Timişoara, Romania, from June 29 to July 4, 2010. It includes three survey articles on traces on a $$C^*$$-algebra, amalgamated products of $$C^*$$-bundles, and compactness of composition operators, as well as ten papers containing original research on several topics: single operator theory, $$C^*$$-algebras, moment problems, differential and integral operators, and complex function theory. A publication of the Theta Foundation. Distributed worldwide, except in Romania, by the AMS. Readership Graduate students and research mathematicians interested in operator theory. Table of Contents A. M. Bikchentaev -- Characterization of traces on $$C^*$$-algebras: A survey E. Blanchard -- Amalgamated products of $$C^*$$-bundles E. Boasso -- The Drazin spectrum in Banach algebras B. E. Breckner and C. Varga -- On problems involving the weak Laplacian operator on the Sierpinski gasket S. Grigorian and A. Kuznetsova -- On a category of nuclear $$C^*$$-algebras L. Lemnete-Ninulescu -- Truncated trigonometric and Hausdorff moment problems for operators N. Lupa and M. Megan -- Rolewicz type theorems for nonuniform exponential stability of evolution operators on the half-line M. Megan, T. Ceauşu, and L. Biriş -- On some concepts of stability and instability for cocycles of linear operators in Banach spaces H. Queffélec -- A tentative comparison of compactness of composition operators on Hardy-Orlicz and Bergman-Orlicz spaces F. Rădulescu -- A universal, non-commutative $$C^\ast$$-algebra associated to the Hecke algebra of double cosets C. Stoica and M. Megan -- On nonuniform exponential dichotomy for linear skew-evolution semiflows in Banach spaces L. Suciu and N. Suciu -- On the asymptotic limit of a bicontraction A. Totoi -- Integral operators applied on classes of meromorphic functions defined by subordination and superordination