*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)

Houston Journal of Mathematics

*Contents*

**Gerald A. Anderson
**

Unlinking Lambda-Homology Spheres, pp.
147-151.

**Joseph Barback
**

On Tame Regressive Isols, pp.
153-159.

**Clement L. DeMayo
**

Mock-Realcompactness and the Equational Completion of Countable Sets, pp.
161-165.

**David E. Dobbs, Marco Fontana, James A. Huckaba, Ira J. Papick
**

Strong Ring Extensions and Pseudo-Valuation Domains, pp. 167-184.

**Nazih S. Faour
**

Toeplitz Operators on Bergmann and Hardy Spaces, pp.
185-191.

**Gregory A. Fredricks
**

Functionally Independent Solutions to Certain Systems on Nonlinear First Order Partial Differential Equations, pp.
193-203.

**Terry Lawson
**

Splitting Spheres As Codimension r Doubles, pp. 205-220.

**John C. Mayer
**

Embeddings and Prime End Structure of Chainable Continua, pp.
221-253.

**Robert Mullins, Michael Ziegler
**

On a Subclass of Functions of Positive Real Part With Negative Coefficients, pp.
255-271.

**T. H. Pate
**

A Unifying Context for the Classical Cauchy Initial Value Problem and the Type of Problelm Solvable Using an Iteration Procedure Suggested by Neuberger, pp. 273-284.

**Mohan S. Putcha
**

On Homomorphisms of Algebraic Semigroups, pp.
285-287.

**Lee A. Rubel
**

An Elimination Theorem for Systems of Algebraic Differential Equations, pp.
289-295.

**Richard H. Warren
**

The Number of Topologies, pp. 297-301.