Barrier cone

In mathematics, specifically functional analysis, the barrier cone is a cone associated to any non-empty subset of a Banach space. It is closely related to the notions of support functions and polar sets. ==Definition== ==Related notions== defined for each continuous linear functional ℓ on X, is known as the support function of the set K; thus, ...
Found on http://en.wikipedia.org/wiki/Barrier_cone
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