#### Abstract

Consider the circle group T = R mod 2_ as the interval [0, 1). Then each x 2 T has a binary expansion: x =P1 k=1 xk2−k where each xk is 0 or 1. Let S be the set of x with a binary expansionsuch that the number of 1's does not exceed the number of the leading zeros by more than one. The authors prove that the countable compact set S cannot be expressed as the union of a finite number of Dirichlet sets.

#### Recommended Citation

D.
E.
Grow
and
M.
Insall,
"Further Properties of an Extremal Set of Uniqueness," *Colloq. Math*, American Mathematical Society, Jan 1998.

#### Department(s)

Mathematics and Statistics

#### Document Type

Article - Journal

#### Document Version

Final Version

#### File Type

text

#### Language(s)

English

#### Rights

© 1998 American Mathematical Society, All rights reserved.