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1.
Bnach 空间中远达和同时远达问题的适定性   总被引:2,自引:0,他引:2  
倪仁兴  李冲 《数学学报》2000,43(3):421-426
本文研究Bn ach空间X中远达和同时远达问题的适定性,在集合的Husdorff距离下,对X中的闭凸子集D和相对弱紧的有界闭子集K,证明了下述结果:若D关于K严格凸和有Kdec性质,则D中所有使远达问题mxx,K是适定的点x全体在D中是Gδ型集.作为应用,得到了同时远达问题适定性的类似结果.  相似文献   

2.
倪仁兴  李冲 《数学学报》2000,43(3):421-426
本文研究Banach空间X中远达和同时远达问题的适定性,在集合的Haus- dorff距离下,对X中的闭凸子集D和相对弱紧的有界闭子集K,证明了下述结果: 若D关于K严格凸和有Kadec性质,则D中所有使远达问题 max{x,K}是适定的 点x全体在D中是Gδ型集.作为应用,得到了同时远达问题适定性的类似结果.  相似文献   

3.
赋范线性空间中同时远达点的唯一性   总被引:1,自引:0,他引:1  
1 引言 设X为一实赋范线性空间,给定X中的子集G和有界子集K,令(?)和C分别表示X的所有非空有界子集与相对紧子集的全体,对A∈B,记 若x_(0)∈K满足sup||a-x_(0)||=Fk(A),则称x_(0)是A关于K的同时远达点,A关于K的同时远达点的全体记为Q_(K)(A),即  相似文献   

4.
设C是实Banach空间X中有界闭凸子集且O是C的内点,G是X中非空有界闭的相对弱紧子集.记K(X)为X的非空紧凸子集并赋Hausdorff距离.称广义共同远达点问题maxc(A,G)是适定的是指它有唯一解(x0,z0)且它的每个极大化序列均强收敛到(x0,z0).在C是严格凸和Kadec的假定下,我们运用不同于DeBlasi,MyjalandPapini和Li等人的方法证明了集{A∈K(X);maxc(A,G)是适定的}含有K(X)中稠Gδ集,这本质地推广和延拓了包括DeBlasi,MyjakandPapini和Li等人在内的近期相应结果.  相似文献   

5.
研究了有界集关于一般集合的限制Chebyshev中心的存在唯一性。在集合的Hausdorff距离下,引进了有界集空间中的几乎Chebyshev子集的概念。证明了一致凸(自反局部一致凸)Banach空间中的任何闭子集都是关于有界集(紧凸子集)的几乎Chebyshev子集。  相似文献   

6.
Banach空间中同时逼近问题的适定性   总被引:1,自引:0,他引:1       下载免费PDF全文
研究一般Banach空间X中同时逼近问题的适定性.对严格凸的KadecBanach空间X中的相对有界弱紧闭子集G,建立了关于最佳同时逼近问题适定Bair纲结果.进一步,当X是一致凸空间时,证明了E(G)中使其最佳同时逼近问题不适定的序列在E(G)中是一个σ-多孔集.另外,还研究了关于最佳同时逼近元具有分歧域的集合G的几乎性.  相似文献   

7.
设C是实Banach空间X中有界闭凸子集且0是C的内点,G是X中非空闭的有界相对弱紧子集.记K(X)为X的非空紧凸子集全体并赋Hausdorff距离,KG(X)为集合{A∈K(X);A∩G=}的闭包.称广义共同逼近问题minC(A,G)是适定的是指它有唯一解(x0,z0),且它的每个极小化序列均强收敛到(x0,z0).在C是严格凸和Kadec的假定下,证明了{A∈K(X);minC(A,G)是适定的}含有KG(X)中稠Gδ子集,这本质地推广和延拓了包括De Blasi,Myjak and Papini[1]、Li[2]和De Blasi and Myjak[3]等人在内的近期相应结果.  相似文献   

8.
空间中同时逼近问题的适定性   总被引:2,自引:0,他引:2       下载免费PDF全文
李冲 《中国科学A辑》2002,32(1):10-22
研究一般Banach空间X 中同时逼近问题的适定性. 对严格凸的Kadec 空间X中的相对有界弱紧闭子集G,建立了关于最佳同时逼近问题适定Bair纲结果. 进一步, 当X是一致凸空间时, 证明了E(G)中使其最佳同时逼近问题不适定的序列在E(G)中是一个δ -多孔集. 另外, 还研究了关于最佳同时逼近元具有分歧域的集合G的几乎性.  相似文献   

9.
经典的Mazur定理叙述的是,若K是Banach空间X的紧子集,则K的闭凸包,conv(K)也是紧的.设(CC(X),h)是X的所有非空紧凸子集族,并赋予其Hausdorff距离h.假设K是CC(X)的紧子集,将在超空间CC(X)上定义凸性,并证明(conv(K),h)是紧的.  相似文献   

10.
中X是自反Banach空间,K是X的有界、闭、凸子集。研究包含(M)型算子的变分不等式问题:A↑f∈X,求u∈K,使(w-f,v-u)≥0,w∈Tu。其中T是一个有限连续.(M)型、有界集值映射。利用KKM映射和Gwinner定理,我们得到了该变分不等式可解性的结果。最后讨论了这样的变分不等式它的应用。  相似文献   

11.
The uniqueness and existence of restricted Chebyshev center with respect to arbitrary subset are investigated. The concept of almost Chebyshev sets with respect to bounded subsets is introduced. It is proved that each closed subset in a reflexive locally uniformly convex (uniformly convex, respectively) Banach space is an almost Chebyshev subset with respect to compact convex subsets (bounded convex subsets and bounded subsets, respectively). Project supported by the National Natural Science Foundation of China, Natural Science Foundation of Zhejiang Province, and the State Major Key Project for Basic Researchers of China.  相似文献   

12.
首先给出在随机赋范模中子集的随机最远点的概念.进一步,利用随机一致凸性和经典一致凸性之间的联系证明了下面的结果:令(E,||·||)为完备的随机一致凸的随机赋范模,S为E中几乎处处有界并在(ε, λ)一拓扑下的闭子集,则具有S中随机最远点的集合稠于E.  相似文献   

13.
LetS be a weakly compact subset of a Banach spaceB. We show that of all points inB which have farthest points inS contains a denseG 5 ofB. Also, we give a necessary and sufficient condition for bounded closed convex sets to be the closed convex hull of their farthest points in reflexive Banach spaces.  相似文献   

14.
该文考察Banach空间上的远达函数的可导性与远达点的存在性间的关系,指出某些Banach空间上的远达函数(对有界闭集而言)具等于1或-1的单侧方向导数蕴含远达点的存在性,并给出了Banach空间CLUR和LUR的新等价刻划.  相似文献   

15.
The relationship between directional derivatives of generalized farthest functions and the existence of generalized farthest points in Banach spaces is investigated. It is proved that the generalized farthest function generated by a bounded closed set having a one-sided directional derivative equal to 1 or −1 implies the existence of generalized farthest points. New characterization theorems of (compact) locally uniformly convex sets are given.  相似文献   

16.
We consider a class of convex bounded subsets of a separable Banach space. This class includes all convex compact sets as well as some noncompact sets important in applications. For sets in this class, we obtain a simple criterion for the strong CE-property, i.e., the property that the convex closure of any continuous bounded function is a continuous bounded function. Some results are obtained concerning the extension of functions defined at the extreme points of a set in this class to convex or concave functions defined on the entire set with preservation of closedness and continuity. Some applications of the results in quantum information theory are considered.  相似文献   

17.
In this paper, we address the question whether in a given Banach space, a Chebyshev center of a nonempty bounded subset can be a farthest point of the set. We obtain a characterization of two-dimensional real strictly convex spaces as those ones where a Chebyshev center cannot contribute to the set of farthest points of a subset. In dimension greater than two, every non-Hilbert smooth space contains a subset whose Chebyshev center is a farthest point. We explore the scenario in uniformly convex Banach spaces and further study the roles played by centerability and Mcompactness in the scheme of things to obtain a step by step characterization of strictly convex Banach spaces.  相似文献   

18.
In this paper, we consider a problem of best approximation (simultaneous farthest point) for bounded sets in a real normed linear space X. We study simultaneous farthest point in X by elements of bounded sets, and present various characterizations of simultaneous farthest point of elements by bounded sets in terms of the extremal points of the closed unit ball of X *, where X * is the dual space of X. We establish the characterizations of simultaneous farthest points for bounded sets in , the space of all real-valued continuous functions on a compact topological space Q endowed with the usual operations and with the norm . It is important to state clearly that the contribution of this paper in relation with the previous works (see, for example, [9, Theorem 1.13]) is a technical method to represent the distance from a bounded set to a compact convex set in X which specifically concentrates on the Hahn-Banach Theorem in X.  相似文献   

19.
We prove that a bounded convex lower semicontinuous function defined on a convex compact set K is continuous at a dense subset of extreme points. If there is a bounded strictly convex lower semicontinuous function on K, then the set of extreme points contains a dense completely metrizable subset.  相似文献   

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