History: Exceptional minimal sets of group actions on the circle

Exceptional minimal sets of group actions on the circle
by Steven Hurder

HISTORY:

The paper grew out of studying the question, when is an excptional minimal set contained in the set $E(\varphi)$, and if it is, what does this mean? I still don't know the answer to this question, but the results of this paper are a corollary of the question.