HOUSTON JOURNAL OF
MATHEMATICS

Archived Edition Vol. 10, No. 1, 1984

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

Samuel Omoloye Ajala
Differentiable Structures on Products of Spheres, pp. 1-14.

Christopher Allday, Stephen Halperin
Sullivan-deRham Theory for Rational Alexander-Spanier Cohomology, pp. 15-33.

Morton Brown
A New Proof of Brouwer's Lemma on Translation Arcs, pp. 35-41.

Paul Hill
The Classification of N-Groups, pp. 43-55.

Martin A. Magid
Indefinite Einstein Hypersurfaces With Imaginary Principal Curvatures, pp. 57-61.

S. Miklos
Confluent and Related Local Expansions on Graphs, pp. 63-74.

James Osterburg, Jae Keol Park
Morita Contexts and Quotient Rings of Fixed Rings, pp. 75-80.

P. Penner
Hyperidentities of Semilattices, pp. 81-108.

Zbigniew Piotrowski, Andrzej Szymanski
Concerning Blumberg's Theorem, pp. 109-115.

L. Thomas Ramsey, Benjamin B. Wells
Interpolation Sets in Bounded Groups, pp. 117-125.

M. L. Narayana Rao, K. Kuppu Swamy Rao, K. Satyanarayana
A Third Flag Transitive Plane of Order 27, pp. 127-145.

Hisamitsu Serizawa
m-Browder-Accretiveness of a Quasilinear Differential Operator, pp. 147-152.