Abstract
In this paper we consider two facts concerning shells. First, we deal with
?nested? (decreasing or increasing) sequences of shells. We prove that the
intersection, as well as the closure of the union of these sequences, is a
shell. Secondly, we consider some questions raised in a paper by Stiles on
shells, published half century ago. He left open some questions, also
connected with ?spheres? (boundaries of balls), and with a finite
intersection property. Here we give a new result on these problems.
Publisher
National Library of Serbia