## HOUSTON JOURNAL OF MATHEMATICS

### Archived Edition
Vol. 17, No. 4, 1991

*Editors*: H. Brezis (Paris), G.G. Johnson (Houston), J.A. Johnson (Houston), A. Lelek (Houston), J. Nagata (Osaka), B.H. Neumann (Australian National University), G. Pisier (Paris), G.-C. Rota (MIT), R. Scott (Houston)

*Managing Editor*: V. Paulsen (Houston)

Houston Journal of Mathematics

**This issue is dedicated to the influence
and legacy of** **Domingo Herrero. **

He was a leader in operator theory, a **wonderful friend and his infectious
enthusiasm captured** **many people. **

His premature demise is a personal and **professional loss to many of us.**

**Kenneth R. Davidson**

**Norberto Salinas**

**Guest editors for HJM 17(4)**

Picture of Domingo Herrero

*Contents*

**Kenneth R. Davidson
**

Domingo Herrero: His Theorems and Problems, pp. 453-476.

**Domingo A. Herrero, David R. Larson, Warren R. Wogen
**

Semitriangular Operators, pp.
477-499.

**Leonid Gurvits, Leiba Rodman, Ilya Spitkovsky
**

Spectral Assignment for Hilbert Space Operators, pp.
501-523.

**Nakhle Asmar, Earl Berkson, T. A. Gillespie
**

Transferred Bounds for Square Functions, pp. 525-550.

**Alan T. Paterson
**

Invariant Mean Characterizations of Amenable C*-Algebras, pp.
551-565.

**S. C. Power
**

Singular Projection Nests in UHF C*-Algebras, pp.
567-579.

**D. Hadwin, E. Nordgren, M. Radjabalipour, H. Radjavi, P. Rosenthal
**

On Simultaneous Triangularization of Collections of Operators, pp. 581-602.

**Raul E. Curto, Lawrence A. Fialkow
**

Recursiveness, Positivity, and Truncated Moment Problems, pp.
603-635.

**Bernard Chevreau, Carl Pearcy
**

On Common Noncyclic Vectors for Families of Operators, pp. 637-650.

**Dan Voiculescu
**

Entropy of Dynamical Systems and Perturbations of Operators, II, pp. 651-661.