Definition:Minkowski Functional of Open Convex Set

Definition
Let $\struct {X, \norm \cdot}$ be a normed vector space.

Let $C$ be an open convex subset of $X$ with $0 \in C$.

We define the Minkowski functional of $C$, $p_C : X \to \hointr 0 \infty$ by:


 * $\map {p_C} x = \inf \set {t > 0 : t^{-1} x \in C}$

for each $x \in X$.

Also see

 * Minkowski Functional of Open Convex Set is Well-Defined