Exposed point
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In mathematics, an exposed point of a convex set is a point at which some continuous linear functional attains its strict maximum over .[1] Such a functional is then said to expose . There can be many exposing functionals for . The set of exposed points of is usually denoted .
A stronger notion is that of strongly exposed point of which is an exposed point such that some exposing functional of attains its strong maximum over at , i.e. for each sequence we have the following implication: . The set of all strongly exposed points of is usually denoted .
There are two weaker notions, that of extreme point and that of support point of .
References
- ^ Simon, Barry (June 2011). "8. Extreme points and the Krein–Milman theorem" (PDF). Convexity: An Analytic Viewpoint. Cambridge University Press. p. 122. ISBN 9781107007314.
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