## HOUSTON JOURNAL OF MATHEMATICS

### Archived Edition
Vol. 16, No. 1, 1990

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

*Managing Editor*: V. Paulsen (Houston)

Houston Journal of Mathematics

*Contents*

**Alejandro Illanes
**

Arcwise Disconnecting Subsets of Hyperspaces, pp. 1-6.

**T. Del Vecchio
**

Strongly Nonlinear Problems With Hamiltonian Having Natural Growth, pp. 7-24.

**E. Zuazua
**

Oscillation Properties for Some Damped Hyperbolic Equations, pp. 25-52.

**Joao-Paulo Dias, Mario Figueira
**

Non-Existence of Bound States for a Nonlinear Dirac Equation, pp. 53-58.

**M. E. Adams, R. Beazer
**

The Intersection of Principal Congruences on de Morgan Algebras, pp. 59-70.

**Jurg Schmid
**

On the Structure of Free Pseudocomplemented Semilattices, pp. 71-86.

**Claudio Saccon
**

On an Evolution Problem With Free Boundary, pp. 87-120.

**Robert M. Tardiff, Homer W. Austin
**

Convexity and a Generalized Minkowski Inequality, pp. 121-128.

**F. G. J. Wiid
**

Sheaf Representation of Normed Spaces, pp. 129-138.

**Satyanad Kichenassamy
**

Local Index of Potential Operators of Monotone Type, pp. 139-149.