共查询到20条相似文献,搜索用时 93 毫秒
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Orlicz序列空间的一致单调系数及应用 总被引:3,自引:0,他引:3
本文给出了Orlicz序列空间一致单调系数数值,同时给出了Orlicz序列空间具有一致单调性的条件,进而讨论具有一致单调性的Orlicz序列空间中的最佳逼近算子的一些特征。 相似文献
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本文给出了赋Orlicz范数的Musielak-Orlicz序列空间的局部一致凸性,(H)性质,(S)性质的判据。 相似文献
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本文给出了赋Orlicz范数的Musielak-Orlicz序列空间的局部一致凸性,(H)性质,(S)性质的判据. 相似文献
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本文讨论赋Orlicz范数的Orlicz序列空间LM,主要结果如下:(1)LM具有Lami-Dozo性质 相似文献
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在赋Orlicz范数的Orlicz空间中,给出最佳逼近算子单调性的一个充分条件和最佳逼近元存在定理. 相似文献
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本文引进了Kantorovitch算子型的二元修正Jackson三角插值多项式,给出了其在Orlicz空间中的收敛阶,作了推论,给出了二元修正Hermite-Fejer插值算子在带Orlicz空间中的逼近的量化估计。 相似文献
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给出了拓扑线性空间中的一个Drop定理.利用此Drop定理,证明了拓扑线性空间中的每个序列紧凸集具有Drop性质;每个可数紧闭凸集具有拟Drop性质.而且结出了拓扑线性空间中Drop性质和拟Drop性质的序列流特征.也讨论了Drop性质和拟Drop性质与泛函取极值之间的联系. 相似文献
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The gliding hump property in vector sequence spaces 总被引:4,自引:0,他引:4
Charles Swartz 《Monatshefte für Mathematik》1993,116(2):147-158
It is shown that vector sequence spaces with a gliding hump property have many of the properties of complete spaces. For example, it is shown that the -dual of certain vector sequence spaces with a gliding hump property are sequentially complete with respect to the topology of pointwise convergence and also versions of the Banach-Steinhaus Theorem are established for such spaces. 相似文献
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We study the class of r.i. spaces in which Cesaro means of any weakly null martingale difference sequence is strongly null.
This property is related to the Banach-Saks property. We show that in classical (separable) r.i. spaces (such as Orlicz, Lorentz
and Marcinkiewicz spaces) these properties coincide but this is no longer true for general r.i. spaces. We locate also a class
of r.i. spaces having this property where an analogue of the classical Dunford-Pettis characterization of relatively weakly
compact subsets in L
1 holds.
Research was partially supported by the ARC and NSF grant DMS-0244515. 相似文献
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We introduce a new property between the q-concavity and the lower q-estimate of a Banach lattice and we get a general method to construct maximal symmetric sequence spaces that satisfies this new property but fails to be q-concave. In particular this gives examples of spaces with the Orlicz property but without cotype 2. 相似文献
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We investigate the diagonal sequence property in Banach spaces with weaker topologies. In particular, we present examples of Banach spaces with weaker locally convex topologies which have the diagonal sequence property but are not Fréchet–Urysohn. The examples answer negatively a question of Averbukh and Smolyanov. We give also a very simple proof of the fact that each Banach space contains a subset A whose weak closure includes 0, but 0 is not contained in the weak closure of any bounded subset of A. 相似文献
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四元数Hilbert空间在应用物理科学特别是量子物理中占有重要地位.本文讨论四元数Hilbert空间的框架理论, 在四元数Hilbert空间中引入了Riesz基的概念, 在此基础上刻画了Riesz基,给出了它们的一些等价条件; 特别地, 得到了四元数Hilbert空间中的一个序列是Riesz基的充要条件是它是一个具有双正交序列的完备Bessel序列,且它的双正交序列也是一个完备Bessel序列; 并进一步证明了双正交序列中一个序列的完备性可以从特征刻画中去除.文中举例说明了双正交性、完备性和Bessel性质之间的关系. 相似文献
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María D. Acosta Mieczysław Mastyło Maryam Soleimani-Mourchehkhorti 《Journal of Functional Analysis》2018,274(9):2673-2699
We study the Bishop–Phelps–Bollobás property for operators between Banach spaces. Sufficient conditions are given for generalized direct sums of Banach spaces with respect to a uniformly monotone Banach sequence lattice to have the approximate hyperplane series property. This result implies that Bishop–Phelps–Bollobás theorem holds for operators from into such direct sums of Banach spaces. We also show that the direct sum of two spaces with the approximate hyperplane series property has such property whenever the norm of the direct sum is absolute. 相似文献
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Restricted non-linear approximation is a type of N-term approximation where a measure ν on the index set (rather than the counting measure) is used to control the number of terms in the approximation. We show that embeddings for restricted non-linear approximation spaces in terms of weighted Lorentz sequence spaces are equivalent to Jackson and Bernstein type inequalities, and also to the upper and lower Temlyakov property. As applications we obtain results for wavelet bases in Triebel–Lizorkin spaces by showing the Temlyakov property in this setting. Moreover, new interpolation results for Triebel–Lizorkin and Besov spaces are obtained. 相似文献
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It is well-known that the Kadec-Klee property is an important property in the geometry of Banach spaces. It is closely connected with the approximation compactness and fixed point property of non-expansive mappings. In this paper, a criterion for Musielak-Orlicz function spaces equipped with the Orlicz norm to have the Kadec-Klee property are given. As a corollary, we obtain that a class of non-reflexive Musielak-Orlicz function spaces have the Fixed Point property.
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