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In an arbitrary Minkowski space M, n2, let there be given an arbitrary finite set P of weighted points whose affine hull is n-dimensional. We show that the unit ball B of M has smooth boundary if and only if each median hyperplane (minimizing the sum of weighted distances with respect to P) is spanned by n affinely independent points from P. Moreover, B has the same property if and only if every center hyperplane (minimizing the maximal weighted distance with respect to P) has the same maximal distance to at least n+1 affinely independent points from P. 相似文献
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设u=Tri(A,M,B)是三角代数.证明了在一般的假设下,如果线性映射δ:u→u,满足对任意的U,V,W∈u且UV=UW=0(或U·V=U·W=0),有δ([[U,V],W])=[[δ(U),V],W]+[[U,δ(V)],W]+[[U,V],δ(W)],则对任意U∈u,δ(U)=φ(U)+h(U),其中φ:u→u是一个导子,线性映射h:u→Z(u),满足对任意的U,V,W∈u且UV=UW=0(或U·V=U·W=0),有h([[U,V],W])=0. 相似文献
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The double integral representing the entropy Stri of spanning trees on a large triangular lattice is evaluated using two different methods, one algebraic and one graphical.
Both methods lead to the same result
2000 Mathematics Subject Classification: Primary—05A16, 33B30, 82B20 相似文献
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设Trn(R)表示定义在实数域R上的n×n阶上三角矩阵的集合,φ是定义Trn(R)上线性映射.如果对任意X∈Trn(R)有Xφ(X)=φ(X)X成立,称φ是线性交换映射.本文利用初等的矩阵计算方法描述了当φ(I)=I时,线性交换映射φ的表示形式,而且给出了φ的Frobenius范数‖φ(X)‖F的估计. 相似文献
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作者给出赋Luxemburg范数Musielak-Orlicz序列空间光滑点的支撑泛函的刻画.进一步,给出赋Orliez范数和赋Luxemburg范数Musielak-Orlicz序列空间的粗性,点态粗的充分必要条件. 相似文献
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本文讨论了多复变中混合赋范空间、Dirichlet型空间、Bloch型空间等全纯函数空间的一些等价刻画,获得了一系列充要条件. 相似文献
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n级三角矩阵环上的模范畴和同调特征 总被引:1,自引:0,他引:1
本文给出了n级三角矩阵环Гn的定义.证明了n级三角矩阵代数Гn上的有限生成模范畴mod Гn与范畴Гn(?)等价,得到了诸如Гn的Jacobson根,Гn(?)的不可分解投射对象的形式及Гn的整体维数等性质. 相似文献
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对具光滑边界αM的Riemann流形(M,g),本文建立了Sobolev空间H(M)的等价范数 相似文献
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In this paper we first discuss the relations between some G-M-type spaces, and the previous eight kinds of G-M-type Banach spaces are merged into four different kinds. Then we build a Generalized Operator Extension Theorem, and introduce the concept of complete minimal sequences. Some sufficient and necessary conditions under which a Banach space is a hereditarily indecomposable space are given. Finally, we give some characterizations of hereditarily indecomposable Banach Spaces. 相似文献
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设φ(z)=(φ1(z),…,φ_n(z))是D~n到自身的一个全纯映射,ψ(z)是D~n上的全纯函数,其中D~n是C~n中的单位多圆柱.研究了单位多圆柱上Bloch型空阊之间的加权复合算子ψC_φ的本性范数,并给出了其上下界估计. 相似文献
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SupportingFunctionsandTheDifferentiabilitiesoftheNormsonBanachSpaces¥WangJiangen(王建根)(LuoyangTeacher'sCollege)Abstract:Inthis... 相似文献
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本文在L-fuzzy拓扑空间中,针对L-fuzzy子集定义了Mr-复盖及具有有限Mr-交性质的闭集族等概念,并以此刻画了近良紧集的一组特征,证明了近良紧性对正则闭集遗传以及是“L-goodextension”等结论。 相似文献
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Jingjing Fu 《Journal of Mathematical Analysis and Applications》2011,381(1):280-298
In this paper, Morrey type Besov and Triebel-Lizorkin spaces with variable exponents are introduced. Then equivalent quasi-norms of these new spaces in terms of Peetre?s maximal functions are obtained. Finally, applying those equivalent quasi-norms, the authors obtain the atomic, molecular and wavelet decompositions of these new spaces. 相似文献
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This note established equivalence relations among the matrix norms related to the lp norm and the lp operator norm for 1≤p≤∞ , which completes the comparison results in [2]. 相似文献