首页 | 本学科首页   官方微博 | 高级检索  
相似文献
 共查询到20条相似文献,搜索用时 62 毫秒
1.
本文讨论了Z[-5]上不可分的正定Hermite型的构作.给出了所有秩为2判别式等于2的不可分的正定Hermite型.当秩n≥3时,证明了存在Z[-5]上判别式等于2的不可分的正定Hermite型,并给出了它们的明显结构.  相似文献   

2.
本文讨论了Z[(-5)~(1/2)]上不可分的正定 Hermite型的构作.给出了所有秩为 2判别式等于2的不可分的正定Hermite型。当秩n ≥ 3时,证明了存在Z[(-5)~(1/2)]上判别式等于2的不可分的正定Hermite型,并给出了它们的明显结构.  相似文献   

3.
朱福祖 《中国科学A辑》1992,35(6):561-571
本文给出了构作Z[m1/2i]上不可分的正定幺模n秩Hermite格当m?3(mod4)时的方法.对任何自然数n,除了n=2,3,4,5(n=2,3)的例外情形,证明了存在Gauss整环Z[i](整环Z[21/2i])上不可分的正定幺模n秩正规Hermi-te格并给出它们的明显结构.又对任何n=4k(n=2k)构作了Z[i][(Z21/2i])上不可分的正定幺模n秩偶Hermite格.  相似文献   

4.
朱福祖 《中国科学A辑》2000,30(3):210-217
给出构作虚二次域Q( √-m)的整数环Rm 上的不可分解的正定Hermite型的方法 .对任意自然数n≥ 2 (n≥ 1 3或奇数n≥ 3)和不含平方因子的m =1 2k +t,k≥ 1且t∈ {1 ,7}(k≥ 1且t=2或k≥ 0且t∈ {5 ,1 0 ,1 1 }) ,存在环Rm 上n秩不可分解的正定整Hermite型 ,其判别式为 2 ,并给出它们的明显结构 .对于判别式不等于2的情况也做了相应的讨论 .  相似文献   

5.
设 R 为虚二次域 Q(-11)~(1/2)的代数整数环,C_(n,Δ_n) 为秩 n 而判别式=Δ_n 的 R上正定 Hermite 型的类数。作者应用 Hermite 约简理论确定了类数 C_(2,3)=C_(2,4)=C_(2,5)=2;C_(3,2)=C_(3,3)=3;C_(4,1)=5并给出了每一类的代表型。  相似文献   

6.
高崇寿 《中国科学A辑》2000,30(6):537-543
对于质量介于 1 .2和 2 .9GeV之间的I =0 ,JPC等于偶++ 无味强子 ,基于粒子衰变到两个赝标介子的衰变宽度和各衰变道的分支比的普遍分析 ,给出判别这粒子是介子还是胶球的两组判别式 .判断已知的I=0 ,JPC=2 ++,f2 (1 5 2 5 )是一个典型的介子 .讨论了判断新的I=0 ,JPC等于偶++ 无味强子的方法  相似文献   

7.
利用推广的邻格方法,完成了Q(61/2)上秩4的在一个阿基米德除子上正定,在另一阿基米德除子上负定的所有幺模格种的分类.  相似文献   

8.
设K~n是Abel数域,Gal(Kn/Q)≌(Z/lZ)n。本文对一般素数l,一般n刻画了Kn的结构。特别是完全解决了Kn的判别式密度问题,即明显给出ⅰ)Kn的判别式。ⅱ)判别式为D的Kn的个数J(D)。ⅲ)判别式小于X的Kn的个数N(X)~,C是明显给出常数(l=2情形引作者另文)。Hasse,Cohn,Baily等的结果作为特殊情形含于本文结果之中。  相似文献   

9.
本文研究二次数域F=Q(d1/2)的K2OF结构,其中d≡-3mod9和d≠-3.找到了关于F=Q((-21)1/2)的K2OF的3阶元和F=Q((15)1/2)的K2OF的生成元.推广了Bass和Tate的一个定理和给出了F=Q((29)1/2)的K2OF的结构以及sLn(OF)(n≥3)的表示关系.  相似文献   

10.
Bernstein算子的逼近   总被引:1,自引:0,他引:1  
本文利用点态光滑模ωφλ2r(f,t)研究了Bernstein算子的r阶线性组合的点态逼近.当1-1/r≤λ≤1时,用ωφλ2r(f,t)给出了—个点态逼近等价定理.且用反例说明了当0≤λ<1-1/r 时,此结论不成立.但若限制0<αφλ2r(f,t)给出  相似文献   

11.
We develop for the queue Mx/M/c an upper bound for the mean queue length and lower bounds for the delay probabilities (that of an arrival group and that of an arbitrary customer in the arrival group). An approximate formula is also developed for the general bulk-arrival queue GIx/G/c. Preliminary numerical studies have indicated excellent performance of the results.  相似文献   

12.
刘修生 《数学杂志》2016,36(5):981-986
本文研究了环Fpm+uFpm+u2Fpm上长度为ps的循环码分类.通过建立环Fpm+uFpm+u2Fpm到环Fpm+uFpm的同态,给出了环Fpm+uFpm+u2Fpm上长度为ps的循环码的新分类方法.应用这种方法,得到了环Fpm+uFpm+u2Fpm长度为ps的循环码的码词数.  相似文献   

13.
Let m and n be integers at least two and R be a nonzero natural number. In this paper, we study the problem of the determination of the proper solutions of the Diophantine equation x m y m equals; Rz n . We raise a question concerning the existence of any proper nontrivial solution of this equation, in case some precise conditions are satisfied by the triple (m, n, R). We prove some results about it.  相似文献   

14.
We previously introduced and analyzed the G t /M t /s t +GI t many-server fluid queue with time-varying parameters, intended as an approximation for the corresponding stochastic queueing model when there are many servers and the system experiences periods of overload. In this paper, we establish an asymptotic loss of memory (ALOM) property for that fluid model, i.e., we show that there is asymptotic independence from the initial conditions as time t evolves, under regularity conditions. We show that the difference in the performance functions dissipates over time exponentially fast, again under the regularity conditions. We apply ALOM to show that the stationary G/M/s+GI fluid queue converges to steady state and the periodic G t /M t /s t +GI t fluid queue converges to a periodic steady state as time evolves, for all finite initial conditions.  相似文献   

15.
Multilevel processor sharing scheduling disciplines have recently been resurrected in papers that focus on the differentiation between short and long TCP flows in the Internet. We prove that, for M/G/1 queues, such disciplines are better than the processor sharing discipline with respect to the mean delay whenever the hazard rate of the service time distribution is decreasing.  相似文献   

16.
In this paper, we study a Ck/Cm/1/N open queueing system with finite capacity. We investigate the property which shows that a product of the Laplace Stieltjes Transforms of interarrival and service times distributions satisfies an equation of a simple form. According to this equation, we present that the stationary probabilities on the unboundary states can be written as a linear combination of vector product-forms. Each component of these products is expressed in terms of roots of an associated characteristic polynomial. As a result, we carry out an algorithm for solving stationary probabilities in Ck/Cm/1/N systems, which is independent of N, hence greatly reducing the computational complexity.  相似文献   

17.
The matrix least squares (LS) problem minx ||AXB^T--T||F is trivial and its solution can be simply formulated in terms of the generalized inverse of A and B. Its generalized problem minx1,x2 ||A1X1B1^T + A2X2B2^T - T||F can also be regarded as the constrained LS problem minx=diag(x1,x2) ||AXB^T -T||F with A = [A1, A2] and B = [B1, B2]. The authors transform T to T such that min x1,x2 ||A1X1B1^T+A2X2B2^T -T||F is equivalent to min x=diag(x1 ,x2) ||AXB^T - T||F whose solutions are included in the solution set of unconstrained problem minx ||AXB^T - T||F. So the general solutions of min x1,x2 ||A1X1B^T + A2X2B2^T -T||F are reconstructed by selecting the parameter matrix in that of minx ||AXB^T - T||F.  相似文献   

18.
We investigate the asymptotic behavior of solutions of a separable difference equation of the form
  相似文献   

19.
We study the dispersive properties of the linear Schr?dinger equation with a time-dependent potential V(t,x). We show that an appropriate integrability condition in space and time on V, i.e. the boundedness of a suitable LrtLsx norm, is sufficient to prove the full set of Strichartz estimates. We also construct several counterexamples which show that our assumptions are optimal, both for local and for global Strichartz estimates, in the class of large unsigned potentials VLrtLsx. Support. The authors are partially supported by the Research Training Network (RTN) HYKE and by grant HPRN-CT-2002-00282 from the European Union. The third author is supported also by INDAM  相似文献   

20.
The aim of the present paper is to give the main characteristics of the finite-source G/M/r queue in equilibrium. Here unit i stays in the source for a random time having general distribution function Fi(x) with density fi(x). The service times of all units are assumed to be identically and exponentially distributed random variables with means 1/μ. It is shown that the solution to this G/M/r model is similar in most important respects to that for the M/M/r model.  相似文献   

设为首页 | 免责声明 | 关于勤云 | 加入收藏

Copyright©北京勤云科技发展有限公司  京ICP备09084417号