A subset \(U\) of a vector space \(V\) is called star-shaped if there is a point \(c \in U\) such that for every \(x\in U\) the line segment between \(c\) and \(x\) is entirely contained in \(U\). The point \(c\) is called center.
A subset \(U\) of a vector space \(V\) is called star-shaped if there is a point \(c \in U\) such that for every \(x\in U\) the line segment between \(c\) and \(x\) is entirely contained in \(U\). The point \(c\) is called center.