共查询到20条相似文献,搜索用时 78 毫秒
1.
In this paper, we introduce the definition of ( m, n) 0-regularity in Γ-semigroups. We investigate and characterize the 20-regular class of Γ-semigroups using Green's relations. Extending and generalizing the Croisot's Theory of Decomposition for Γ-semigroups, we introduce and study the absorbent and regular absorbent Γ-semigroups. We approach this problem by examining quasi-ideals using Green's relations. 相似文献
2.
In this paper, we investigate the properties of solutions of some linear difference equations with meromorphic coefficients, and obtain some estimates on growth and value distribution of these meromorphic solutions. 相似文献
3.
In this paper,the expressions of tail value of risk(TVaR)and exponential tail value of risk(EVaR)for the total risk portfolio are given,which are splitted into two cases: the bivariate case and the multivariate case according to the number of the insurances.Then the risk contributions of the insurances portfolio and the credit portfolio are also obtained. Further more,for clarifying the above results,a numerical example is given. 相似文献
4.
In this paper we derive finite forms of the summation formulas for bilateral basic hypergeometric series 3ψ3,4ψ4 and 5ψ5.We therefrom obtain the summation formulae obtained recently by Wenchang CHU and Xiaoxia WANG.As applications of these summation formulae,we deduce the well-known Jacobi's two and four square theorems,a formula for the number of representations of an integer n as sum of four triangular numbers and some theta function identities. 相似文献
5.
ABDULLAYEV O. Kh 《偏微分方程(英文版)》2014,(4):283-292
In the present paper an existence and uniqueness of solution of the nonlo- cal boundary value problem for the third order loaded elliptic-hyperbolic type equa- tion in double-connected domain have been investigated. At the proof of unequivocal solvability of the investigated problem, the extremum principle for the mixed type equations and method of integral equations have been used. 相似文献
6.
BangHe Li 《中国科学 数学(英文版)》2012,55(4):727-729
For the number of complete shock curves of a conservation law with one space variable,Hopf in 1950 for the Burger equation,and Oleinik in 1956 for the general,stated that it is at most countable.In 1979,the present author published an example to show that the statement of Hopf and Oleinik is wrong.But after so long time,the wrong statement for countability still appeared in some publications,which is at least partly due to that some ones felt difficult to understand Hopf and Oleinik’s proofs being wrong.So,pointing out where they went wrong becomes very necessary. 相似文献
7.
In this paper, the authors investigate the zeros and growth of solutions of second order linear differential equations with entire coefficients of [p, q]-order and obtain some results which improve and generalize some previous results. 相似文献
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9.
Recently Brutman and Passow considered Newman-type rational interpolation to |x| induced by arbitrary sets of symmetric nodes in [-1,1] and gave the general estimation of the approximation error.By their methods,one could establish the exact order of approximation for some special nodes.In the present note we consider the sets of interpolation nodes obtained by adjusting the Chebyshev roots of the second kind on the interval [0,1] and then extending this set to [-1,1] in a symmetric way.We show that in this case the exact order of approximation is O( 1 n 2 ). 相似文献
10.
This article establishes several new geometric inequalities, which refer to the lengthes of the edges of a simplex and interior point, height, lateral area, and the circumradius of another simplex. 相似文献
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12.
关于极大前缀码的刻划的一个注记 总被引:3,自引:0,他引:3
赵平 《数学的实践与认识》2009,39(2)
设X*是字母表X上的自由幺半群,以X*为顶点集构造一个语言图Γ(X*),引入语言图Γ(X*)的横截集的概念,给出了前缀码为极大前缀码的一个刻划,并推广了相关文献的结果. 相似文献
13.
J.W. Cohen 《Stochastic Processes and their Applications》1978,6(3):291-304
For the classical dam model the distribution of the supermum of the dam content between two successive downcrossings of level x>0 by the content process is studied. The result generalizes previous results for the M/G/1 queueing system. The derivation which is rather simple is based on some recent results concerning up- and downcrossings. The resulting distribution is a functional of the solution of a renewal type integral equation occurring frequently in applied probability models. It is shown that this solution is logarithmic concave and that its reciprocal is an infinitely divisible p-function, thus leading to a number of hitherto unknown properties of a certain class of renewal functions. 相似文献
14.
矩阵F分布渐近正态分布的一种方式(英文) 总被引:1,自引:0,他引:1
本文主要讨论矩阵F分布的一致渐近正态性.通过计算矩阵F分布和多元正态分布的Kullback-Leibler距离,找到了矩阵F分布一致渐近正态分布的条件. 相似文献
15.
风险非同质时索赔次数的分布拟合的估计与检验问题 总被引:5,自引:0,他引:5
在非寿险精算中 ,索赔次数的分布一般假设为泊松分布 P(λ) .风险非同质时 λ的分布称为混合分布 .本文考虑了混合分布为三参数伽玛分布时的参数估计以及位置参数的检验问题 相似文献
16.
研究了分次广义Γ-环的弱强分次B row n-M cC oy根与拟弱强分次B row n-M cC oy根,并从不同角度刻划了分次广义Γ-环的弱强分次B row n-M cC oy根.证明了任何一个分次广义Γ-环都有弱强分次B row n-M cC oy根和拟弱强分次B row n-M cC oy根,而且弱强分次B row n-M cC oy根小于等于拟弱强分次B row n-M c-C oy根. 相似文献
17.
We consider the transport through capillarity of an organic material inside a porous medium, using Leverett’s model. We first prove an existence result for a weak solution of this nonlinear evolution problem, using a regularization process. We then describe the asymptotic behavior of the solution, when the permeability kε of the porous medium is associated to a scalar function which only depends on the third variable, assuming that kε (resp. the inverse of kε) converges to some measure λ∗ (resp. λ∗). We use Γ-convergence arguments in order to describe this asymptotic behavior. We finally characterize the asymptotic behavior of the problem, considering special choices of the permeability kε, which correspond to stratified porous media, and give a numerical test for a 1D model. 相似文献
18.
王永平 《数学的实践与认识》2014,(6)
在语言图Γ(X*)概念的基础上,用新引入的语言竹竿l(X*)和语言竹竿集L(X*)的概念形象地刻画了前缀码与极大前缀码:A是前缀码l(X*)∈L(X*),S_l_((X*))∩A或为单点集或为Φ;A是极大前缀码l(X*)∈L(X*),i)S_(l(X*))∩A或为单点集或为Φ.ii)S_(l(X*))∩A=Φ■u∈S_(l(X*)),■a∈A,ω∈X~+使a=uw. 相似文献
19.
Hoang Xuan Phu 《Numerical Functional Analysis & Optimization》2013,34(7-8):835-854
A subset S of some vector space X is said to be outer Γ-convex w.r.t. some given balanced subset Γ ? X if for all x 0, x 1 ? S there exists a closed subset Λ ? [0,1] such that {x λ | λ ? Λ} ? S and [x 0, x 1] ? {x λ | λ ? Λ} + 0.5 Γ, where x λ: = (1 ? λ)x 0 + λ x 1. A real-valued function f:D → ? defined on some convex D ? X is called outer Γ-convex if for all x 0, x 1 ? D there exists a closed subset Λ ? [0,1] such that [x 0, x 1] ? {x λ | λ ? Λ} + 0.5 Γ and f(x λ) ≤ (1 ? λ)f(x 0) + λ f(x 1) holds for all λ ? Λ. Outer Γ-convex functions possess some similar optimization properties as these of convex functions, e.g., lower level sets of outer Γ-convex functions are outer Γ-convex and Γ-local minimizers are global minimizers. Some properties of outer Γ-convex sets and functions are presented, among others a simplex property of outer Γ-convex sets, which is applied for establishing a separation theorem and for proving the existence of modified subgradients of outer Γ-convex functions. 相似文献
20.
In this paper, we focus on combining the theories of fuzzy soft sets with Γ-modules, and establishing a new framework for fuzzy soft Γ-submodules. The main contributions of the paper are 3-fold. First, we present the concepts of (R, S)-bi-Γ-submodules, quasi-Γ-submodules and regular Γ-modules. Meanwhile, some illustrative examples are given to show the rationality of the definitions introduced in this paper. Second, several new kinds of generalized fuzzy soft Γ-submodules are proposed, and related properties and mutual relationships are also investigated. Third, we discover some intrinsic connections between the generalized fuzzy soft Γ-submodules presented in this paper and crisp Γ-submodules, and describe the relationships between regular Γ-modules and the generalized fuzzy soft Γ-submodules presented in this paper. 相似文献