Invariant Subspaces and Other Topics

1. Front Matter

   Pages 1-14

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2. The Stone-Weierstrass Problem for C*-Algebras

   • Charles A. Akemann, Joel Anderson

   Pages 15-32

3. On the Norm-Closure of the Similarity Orbit of Essentially Nilpotent Operators

   • Constantin Apostol

   Pages 33-43

4. Invariant Subspaces and Functional Representations for the C1. Contractions

   • B. Beauzamy

   Pages 45-49

5. Intertwinings and Hyperinvariant Subspaces

   • B. Chevreau

   Pages 51-63

6. On Moduli for Invariant Subspaces

   • M. J. Cowen, R. G. Douglas

   Pages 65-73

7. An Extension of Chacon-Ornstein Ergodic Theorem

   • Radu-Nicolae Gologan

   Pages 75-80

8. Commuting Subnormal Operators Quasisimilar to Multiplication by Coordinate Functions on ODD Spheres

   • J. Janas

   Pages 81-88

9. Some Properties of Masa’s in Factors

   • V. R. F. Jones, Sorin Popa

   Pages 89-102

10. Generalized Resolvents of Dual Pairs of Contractions

    • Heinz Langer, Björn Textorius

    Pages 103-118

11. Annihilators of Operator Algebras

    • David R. Larson

    Pages 119-130

12. On the Derivations with Norm Closed Range in Banach Spaces

    • Lu Shijie

    Pages 131-143

13. On Boolean Algebras of Projections and Prespectral Operators

    • B. Nagy

    Pages 145-162

14. Control Subspaces of Minimal Dimension, and Spectral Multiplicities

    • N. K. Nikolskii, V. I. Vasjunin

    Pages 163-179

15. Derivations of C*-Algebras which are Invariant under an Automorphism Group. II

    • C. Peligrad

    Pages 181-194

16. On Commutators in Properly Infinite W*-Algebras

    • Sorin Popa

    Pages 195-207

17. A Functional Model for the Unitary Dilation of a Positive Definite Map

    • Ion Suciu

    Pages 209-216

18. The Levinson Algorithm in Linear Prediction

    • Dan Timotin

    Pages 217-223

19. Geometric Interpretation of the Essential Minimum Modulus

    • Jaroslav Zemánek

    Pages 225-227

20. Back Matter

    Pages 228-229

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The annual Operator Theory conferences in Timigoara are conceived as a means to promote cooperation and exchange of in­ formation between specialists in all areas of Operator Theory. The present volume consist of papers contributed by the partici­ pants of the 1981 Conference. Since many of these papers contain results on the invariant subspace problem or are related to the role of invariant subspaces in the study of operators or operator systems, we thought it appropiate to mention this in the title of the volume, though the "other topics" have a wide range. As in past years, special sessions concerning other fields of Functio­ nal Analysis were organized at the 1981 Conference, but contri­ butions to these sessions are not included in the present volume. The research contracts of the Department of Mathematics of INCREST with the National Council for Sciences and Technology of Romaliia provided the means for developping the research activity in Functional Analysis; these contracts constitute the generous framework for these meetings. We want also to acknowledge the support of INCREST and the excelent organizing job done by our host - University of Timigoa­ ra-. Professor Dumitru Gagpar and Professor Mircea Reghig are among those people in Timigoara who contributed in an essential way to the success of the meeting.

• C*-algebra
• functional analysis
• operator algebra

• Department of Mathematics, INCREST, Bucharest, Romania

  C. Apostol, R. G. Douglas, B. Sz.-Nagy, D. Voiculescu

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