On Circumradii of Sets and Roughly Contractive Mappings
Hoang Xuan Phu
Abstract. In this paper, circumradii
and diameter of sets are used to estimate the distance between some subset
$S$ of a finitedimensional normed space and any point from $\conv S\setminus
S$, which is applied to prove a fixedpoint theorem for roughly contractive
mappings.
