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2.
In 1960, Baumslag, following up on work of Cernikov for the 1940s, proved that a hypercentral p-group G with G = G p is a divisible Abelian group. In this article, we provide an interesting generalization of this 45 year old result: If a hypercentral p-group G satisfies |G:G p |<∞ (of course, it contains G = G p ), there exists a normal divisible Abelian subgroup D such that |G:D|<∞. 相似文献
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We show that Wahl’s conjecture holds in all characteristics for a minuscule G/P. 相似文献
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陈宝谦 《高校应用数学学报(A辑)》1986,(2)
本文讨论M/G/1排队系统输入过程的一个最优控制问题:假定顾客有几类,系统对每类顾客服务得到的报酬不同,在系统运行过程中如何对顾客进行筛选使得在单位时间内得到的报酬最大,这归结为一个马氏决策规划问题。本文对这一问题进行了讨论,并给出了算法。 相似文献
5.
江涛 《数学物理学报(A辑)》2004,4(6):752-757
关于GI/G/1/∞排队系统的平稳等待时间分布W,已有许多经典的结果描述了其尾分布[AKW-](x)=1-W(x)的等价极限情况.该文结合一些保险与金融领域重要的风险变量,研究了关于分布W的各种局部尾等价式问题. 相似文献
6.
该文研究了$E_k/G/1$排队系统等待时间$W(t)$和队长$L(t)$的 Harris遍历、几何遍历和一致遍历. 首先作者利用判别法给出了$W(t)$的$h$ -骨架链的几种遍历性的充要条件.由此得出$W(t)$的相应结果,然后在$W(t)$的结果的基础上,利用小集的方法得到了队长 $L(t)$的这几种遍历性成立的充要条件. 相似文献
7.
Karl Sigman 《Queueing Systems》2012,70(1):37-43
We present an exact simulation algorithm for the stationary distribution of customer delay for FIFO M/G/c queues in which
ρ=λ/μ<c. In Sigman (J. Appl. Probab. 48A:209–216, 2011) an exact simulation algorithm was presented but only under the strong condition that ρ<1 (super stable case). We only assume that the service-time distribution G(x)=P(S≤x), x≥0, with mean 0<E(S)=1/μ<∞, and its corresponding equilibrium distribution $G_{e}(x)=\mu\int_{0}^{x} P(S>y)\,dy$G_{e}(x)=\mu\int_{0}^{x} P(S>y)\,dy are such that samples of them can be simulated. Unlike the methods used in Sigman (J. Appl. Probab. 48A:209–216, 2011) involving coupling from the past, here we use different methods involving discrete-time processes and basic regenerative
simulation, in which, as regeneration points, we use return visits to state 0 of a corresponding random assignment (RA) model
which serves as a sample-path upper bound. 相似文献
8.
本文给出新Dirichlet级数Σn=0∞aneλns的收敛横坐标σc、一致收敛横坐标σu和绝对收敛横坐标σa的定义.通过指数λn和系数an的关系去估计三个横坐标,并补充证明两类Dirichlet级数Σn=0∞aneλns和Σn=0∞ane-λns的收敛条件是一致的. 相似文献
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In this paper,we study the matched queueing system,MoPH/G/1,where the type-Ⅰ input is a Poisson process,the type-Ⅱ input is a PH renewal process, and the service times are i.i.d. random variables. A necessary and sufficient condition for the stationariness of the system is given.The expectations of the length of the non-idle period and the number of customers served in a non-idle period are obtained. 相似文献
11.
多级适应性休假的M/G/1排队 总被引:6,自引:0,他引:6
在经典M/G/1排队中引入多级适应性休假规则,得到稳态队长、等待时间分布和随机分解,并给出忙期、假期、在线期分布.单重休假和多重休假模型是本文中模型的两个极端情况. 相似文献
12.
考虑Mx/G(M/G)/1(M/G)可修排队系统,且把该系统推广到休假时间、服务时间、修理时间和延误休假时间都为任意分布(不一定连续),利用服务员忙期和拉普拉斯交换,我们直接获得队长瞬态分布的L变换递推式和稳态分布的递推式,以及队长的概率母函数,同时指出了1994年史定华文中存在的错误. 相似文献
13.
《Operations Research Letters》1988,7(5):219-222
Let p∞(n) be the distribution of the number N(∞) in the system at ergodicity for systems with an infinite number of servers, batch arrivals with general batch size distribution and general holding times. This distribution is of importance to a variety of studies in congestion theory, inventory and storage systems. To obtain this distribution, a more general problem is addressed. In this problem, each epoch of a Poisson process gives rise to an independent stochastic function on the lattice of integers, which may be viewed as stochastic impulse response. A continuum analogue to the lattice process is also provided. 相似文献
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P. Mandal C. Nahak 《Applied mathematics and computation》2011,217(21):8141-8148
In this paper we introduce a new type of generalized invex function, called (p, r) − ρ − (η, θ)-invex function and study symmetric duality results under these assumptions. In our study the nonnegative orthants for the constraints are replaced by closed convex cones and their polars. We establish weak and strong duality theorems under (p, r) − ρ − (η, θ)-invexity assumptions for the symmetric dual problems. We also give many examples to justify our results. 相似文献
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We investigate E
/G/1/N-type queuing systems with limited queue. The investigation is based on the potential method proposed by Korolyuk 相似文献
18.
《数学的实践与认识》2015,(19)
应用(G/G')展开法构造出(1+1)维0strovsky方程的10组精确解,这些解的类型主要包含双曲函数通解、三角函数通解和有理函数通解三种形式.对解的性质进行了相应地分析,当对双曲函数通解中的参数取特殊值时,可以得到了孤立波解.当对三角函数通解中引中的参数取特殊值时,可以得到对应的周期波函数解. 相似文献
19.
首先得到l p(G ) (p>1, p≠2)单位球面之间(满)等距算子的表现定理, 然后利用作者过去一个结果导出: 上述算子均可延拓为全空间上的(实)线性等距算子. 相似文献
20.
For any complcx λ≠integral, and any natural number n, the product is calcuated and Hadmard''s finite part of obtained. The product is also obtained when λ+μ is a complex number of any other possible kind, and μ is a complex number ≠ integral. The products are also calculated. Any special example of these kinds of products has not yet been calculated. 相似文献