By Ernst Albrecht, Jörg Eschmeier (auth.), R. G. Douglas, C. M. Pearcy, B. Sz.-Nagy, F.-H. Vasilescu, Dan Voiculescu, Gr. Arsene (eds.)
The annual Operator idea meetings, prepared via the dept of arithmetic of INC relaxation and the collage of Timi?oara, are meant to advertise cooperation and alternate of data among experts in all parts of operator idea. This quantity includes papers contributed by way of the individuals of the 1984 convention. They mirror a good number of themes, handled through the fashionable operator conception, together with very contemporary advances within the invariant subspace challenge, subalgebras of operator algebras, hyponormal, Hankel and different specific sessions of operators, spectral decompositions, features of dilation idea and so forth. The learn contracts of the dept of arithmetic of INCREST with the nationwide Council for technology and expertise of Romania supplied the potential for constructing the study job in arithmetic; they symbolize the beneficiant framework of those conferences, too. it really is our excitement to recognize the monetary help of UNESCO which additionally contibuted to the luck of this assembly. we're indebted to Professor Israel Gohberg for together with those lawsuits within the OT sequence and for invaluable suggestion within the modifying technique. Birkhauser Verlag used to be very cooperative in publishing this quantity. Mariana Bota, Camelia Minculescu and Rodica Stoenescu handled the tricky job of typing the entire manuscript utilizing a Rank Xerox 860 be aware processor; we thank them for the superb activity they did.
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Extra resources for Advances in Invariant Subspaces and Other Results of Operator Theory: 9th International Conference on Operator Theory, Timişoara, and Herculane (Romania), June 4–14, 1984
2. Barria, J. R. : Unicellular operators, Trans. Amer. Math. Soc. , 284(1984), 229-246. 17 © 1986 Birkhauser Verlag Basel ISOMETRIC DILATIONS OF COMMUTING CONTRACTIONS. IV Zoia Ceau~escu and I. Suciu In this paper we continue the study developed in  of the set of all A ndo dilations of a given pair of commuting contractions. We show that any Ando dilation can be produced in a canonical way by an appropriate adequate isometry. For a special class of Ando dilations we exhibit a system of free parameters which produces it (Section 3).
LA denotes the preannihilator of A in C I (H). If x and yare vectors in H, we denote by x€)y the rank-one operator defined by (x®y)(u) = (u,y)x, u E H. If A is a given dual algebra under consideration, we denote by [x®Y]A' or simply [x(8)y] when no confusion will arise, the image in QA of the trace-class operator x(8)y. If one 43 44 wishes to study the invariant subspace problem for operators T on Hilbert space, no generality is lost by supposing that T satisfies II T II = I and that T is an absolutely continuous contraction, meaning by this that in the canonical decomposition T = U ® T', where U is a unitary operator and T' is a completely nonunitary contraction, either U acts on the space (0) or U is an absolutely continuous unitary operator.
G. : A Korovkin theorem for Schwarz maps on C* -algebras, Math. z. 56(1977), 205-207. 15. Rogalski, M. , Publ. Math. Univ. Pierre et Marie Curie. 16. F. : Korovkin's theorem for locally compact abelian groups, Ph. D. Dissertation, Murdoch University, October 1982. 17. E. Korovkin's theorems 27(1979), 197-202. for C* -algebras, J. Fortunato, 70125 Bari Italia. Approx. 17 © 1986 Birkhauser Verlag Basel WITH APPLICATIONS TO o INVARIANT SUBSPACES AND THE BERGMAN SHIFT OPERATOR ON THE THEORY OF THE CLASS A ~ C.