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arXiv 1002.3610math.FAmath-phmath.MGmath.MP
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线性空间中的广义compactness及其应用

Generalized compactness in linear spaces and its applications

V. Yu. Protasov, M. E. Shirokov

摘要:

考虑局部凸空间的子集类$μ$ -紧集。这个类包含了所有的紧集以及一些在应用中广泛使用的非紧集。证明了许多关于紧集的结果可以推广到$μ$ -紧集上.考虑了几个例子。本文的主要结果是将Vesterstrom-O 'Brien定理推广到$μ$ -紧凸集上,证明了紧凸集的特殊性质的等价性(s. t.混合映射的开放性、重心映射的开放性及其对最大测度的限制、任何连续函数的凸包的连续性、任何凹连续函数的凸包的连续性)。证明了Vesterstrom-O 'Brien定理对于由$μ$ -紧性条件的轻微放松所定义的点态$μ$ -紧凸集不成立.所得到的结果量子信息论的应用。

英文摘要:

The class of subsets of locally convex spaces called $μ$-compact sets is considered. This class contains all compact sets as well as several noncompact sets widely used in applications. It is shown that many results well known for compact sets can be generalized to $μ$-compact sets. Several examples are considered. The main result of the paper is a generalization to $μ$-compact convex sets of the Vesterstrom-O'Brien theorem showing equivalence of the particular properties of a compact convex set (s.t. openness of the mixture map, openness of the barycenter map and of its restriction to maximal measures, continuity of a convex hull of any continuous function, continuity of a convex hull of any concave continuous function). It is shown that the Vesterstrom-O'Brien theorem does not hold for pointwise $μ$-compact convex sets defined by the slight relaxing of the $μ$-compactness condition. Applications of the obtained results to quantum information theory are considered.

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