## HOUSTON JOURNAL OF MATHEMATICS

### Archived Edition
Vol. 9, No. 1, 1983

*Editors*: D.G. Bourgin (Houston), J. Hausen (Houston), G.G. Johnson (Houston), B. Jóhnson (Nashville), J.W. Neuberger (Emory), B.H. Neumann (Australian National University)

*Managing Editor*: A. Lelek (Houston)

*Associate Managing Editor*: J.A. Johnson

Houston Journal of Mathematics

*Contents*

**Gunter Bruns
**

Varieties of Modular Ortholattices, pp.
1-7.

**Zvonko Cerin
**

C-e-Movable and (C,D)-e-Tame Compacta, pp.
9-27.

**Thomas A. Fournelle
**

An Example of a Pseudocomplete Nilpotent Group, pp.
29-33.

**Michael Henry, Sam B. Nadler, Jr.
**

Families of Eventually Constant Mappings, pp. 35-48.

**Alice Mason, David C. Wilson
**

Monotone Mappings on n-Dimensional Continua, pp. 49-62.

**AR. Meenakshi
**

On Sums of EP Matrices, pp.
63-69.

**William R. Nico
**

Wreath Products and Extensions, pp.
71-99.

**Young Lim Park
**

The Quasi-F Cover As a Filter Space, pp.
101-109.

**F. D. Pedersen, Walter S. Sizer
**

Relating Certain Semigroup Homomorphisms With Group Retractions, pp.
111-117.

**Daniel S. Silver
**

Embedding 2-Spheres Topologically in Smooth 4-Manifolds, pp. 119-124.

**Jan van Mill
**

A Remark on the Rudin-Keisler Order of Ultrafilters, pp.
125-129.

**David P. Young
**

Singular Nonlinear Diffusion Equations, pp. 131-149.