Published by Duke University Press since its inception in 1935, the Duke Mathematical Journal is one of the world's leading mathematical journals. Without specializing in a small number of subject areas, it emphasizes the most active and influential areas of current mathematics.

### Volume 34, Number 2

#### Publication Date: June 1967

On the mean value of Haar measurable almost periodic functions

Henry W. Davis; 201-214

Congruences on extensions of semigroups

Mario Petrich; 215-223

An algebra of light interior functions

W. V. Caldwell; 225-230

Note on a paper by M. F. Tinsley

Alan Zame; 231

The existence of idempotents in certain operator algebras

R. H. Farrell; 233-237

Action of $T^{n}$ on cohomology lens spaces

Jingyal Pak; 239-242

$\rm {D.C.C.}$ rings with a cyclic group of units

Klaus E. Eldridge and Irwin Fischer; 243-248

Non-analytic functions of two complex variables

G. Kenneth Williams; 249-254

Open continuous mappings of spaces having bases of countable order

H. H. Wicke and J. M. Worrell, Jr.; 255-271

Equivalent conditions for a ring to be a $P$-ring and a note on flat overrings

Max D. Larsen; 273-280

Some theorems on factorable irreducible polynomials

Andrew F. Long; 281-291

A geometric approach to permutation polynomials over a finite field

D. R. Hayes; 293-305

Closed sets of algebraic numbers

H. G. Senge; 307-323

Some properties of relative invariants on bounded domains

Kyong T. Hahn; 325-332

Operator algebras generated by projections

P. A. Fillmore and D. M. Topping; 333-336

On the group of conformal transformations of a compact Riemannian manifold. II

Chuan-Chih Hsiung; 337-341

Unicoherence and related properties

R. F. Dickman, Jr.; 343-351

On the analytic properties of solutions of equation $\Delta u+xu_{x}+yu_{y}+c(r)u=0$

G. S. S. Avila and R. P. Gilbert; 353-362

Submersions and geodesics

Barrett O’Neill; 363-373

Local classification of quotients of complex manifolds by discontinuous groups

David Prill; 375-386