共查询到19条相似文献,搜索用时 62 毫秒
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通过利用非标准分析中的饱和模型,对其中的理想进行了讨论,从而得到了理想的非标准特征,并进一步利用这一特征证明了单子论中的一些相关定理. 相似文献
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可加的广义代数格范畴与 T0 拓扑空间范畴相等价, 从这个观点出发, 作者把可加广义代数格作为一个闭集格, 在其上建立 Urysohn 引理和 Tietze 扩张定理. 这是拓扑理论在格上的一种新推广, 有助于格上拓扑理论的研究和广义连续格理论的应用. 相似文献
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在连续格中, 引入了拟紧元和拟基的概念, 在研究了它们的基本性质的基础上, 给出了连续格的一种表示定理. 相似文献
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设H是复Hilbert空间,B(H)是H上的有界线性算子全体组成的代数,M?B(H)是von Neumann代数,"≤"表示M中的*-偏序,即A,B∈M,若A~*A=A~*B,AA~*=BA~*,则A≤B.本文研究了von Neumann代数中*-偏序的上确界和下确界,证明了von Neumann代数M的子集关于*-偏序的上、下确界和B(H)中的上、下确界一致.同时,给出了M的*-偏序遗传子空间的表示,证明了弱~*闭子空间A?M,满足A∈M,B∈A,由A≤B可得A∈A,当且仅当存在唯一具有相同中心投影的投影对E,F∈M,使得A=EMF. 相似文献
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对于增量具有无限均值及长尾分布的随机游动, Denisov D.等给出了其上确界的尾渐近性的一个充分条件.本文将增量的长尾分布的范围扩大到一个更大的分布族,它真包含了长尾分布族和控制变化尾分布族等.同时,证明了上述的充分条件也足必要的.为此,研究了这个更大分布族的性质,给出了积分加权分布是长尾或次指数的一些充分条件.相应地,还得到了增量具有无限均值的随机游动上确界的局部渐近性的一个等价条件. 相似文献
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关于Robinson序列引理的注记 总被引:1,自引:0,他引:1
The Infintesimal Prolongation Theorem is extended from sequences to nets in k-saturated nonstandard model. As its application, a main property about the topology of uniform convergence is proved. The proof is much simpler than it was; meanwhile, the nonstandard characteristics of convergence with respect to u.c. topology are given. 相似文献
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In this paper, we study the compound binomial model in Markovian environment, which is proposed by Cossette, et al. (2003).
We obtain the recursive formula of the joint distributions of T, X(T − 1) and |X(T)| (i.e., the time of ruin, the surplus before ruin and the deficit at ruin) by the method of mass function of up-crossing
zero points, as given by Liu and Zhao (2007). By using the same method, the recursive formula of supremum distribution is
obtained. An example is included to illustrate the results of the model. 相似文献
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S. S. Kutateladze 《Journal of Applied and Industrial Mathematics》2013,7(3):287-295
This is a biographical sketch and tribute to Abraham Robinson on the 95th anniversary of his birth with a short discussion of the place of nonstandard analysis in the present-day mathematics. 相似文献
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本文从严格的数学分析的思想方法,研究了无穷级数中的狄尼定理,指出它的逆命题是不成立的,同时也给出了反例.后半部分在引用一个引理的基础上,证明了正项级数∑∞n=1an/rαnrβn-1也收敛,即将狄尼定理适当进行推广. 相似文献
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We count lattice paths that remain in the first quadrant. A path can come from only finitely many lattice points, and if no further restrictions apply, can go to infinitely many others. By “further restrictions” we mean a boundary line above which the paths may have to stay. Access privilege to the boundary line itself is granted from certain lattice points in the form of a special access step set, which also may be infinite. Our approach to explicit solutions of such enumeration problems is via Sheffer polynomials and functionals, using results of the Umbral Calculus. 相似文献
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到目前为止,我们所研究的模糊或非模糊的自动机都是有限状态自动机.然而,关于无限状态自动机的定义及它的稳定性和收敛性都没有被讨论过.本文中,我们使用离散的反馈神经网络及网络输出空间划分方法,同时,在梯度更新算法中使用伪梯度方法,给出了模糊无限状态自动机收敛到模糊有限状态自动机的证明. 相似文献
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本文证明高密度情形格点Sierpinski地毯上边渗流模型无穷开串的唯一性,同时给出本模型相变存在性的一个新的证明.一种再标度技巧被发展并用作我们证明的主要工具. 相似文献
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The aim of paper is to give some results, that prepare for studying the problem on cross theorems for separately \((\cdot , W)\)-meromorphic functions. Some general versions of extension theorem of Levi type are extended to the classes of meromorphic functions f on \(D \times (\Delta _r {\setminus } \overline{\Delta })\) with values in a locally convex space F. Here, the function f is assumed that, for each \(z \in D_*,\) the function \(f_z = f(z, \cdot )\) has a (F, W)-meromorphic extension to \(\Delta _r,\) where F is either a locally (or sequentially) complete locally convex space or a Fréchet space, the space \(W \subseteq F'\) is separating (or determines boundedness), \(\Delta _r = \{\lambda \in {\mathbb C}: |\lambda | < r\}\) with \(r > 1, \Delta = \Delta _1\) and D is either a domain in \({\mathbb C}^n\) or a balanced domain in a Fréchet space containing a non-pluripolar balanced convex compact subset, \(D_*\) is dense in D. 相似文献