共查询到20条相似文献,搜索用时 531 毫秒
1.
中国科学技术大学原副校长、数学系教授龚昇先生2011年1月10日不幸病逝.本刊编委会、编辑部于2011年1月第1期发表《沉痛悼念著名数学家龚?教授》一文,简短介绍了他的生平和学术成就.本期特转载他为《中国科学技术大学数学五十年》一书所作的序,以纪念这位杰出的数学家和数学教育家.本文标题为编者所加.1958年,经中共中央... 相似文献
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For any arrangement of hyperplanes in ℂℙ3, we introduce the soul of this arrangement. The soul, which is a pseudo-complex, is determined by the combinatorics of the
arrangement of hyperplanes. In this paper, we give a sufficient combinatoric condition for two arrangements of hyperplanes
to be diffeomorphic to each other. In particular we have found sufficient conditions on combinatorics for the arrangement
of hyperplanes whose moduli space is connected. This generalizes our previous result on hyperplane point arrangements in ℂℙ3.
This work was partially supported by NSA grant and NSF grant 相似文献
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给出了不同于其他教材的平方和分解形式,它可以更为直观地证明和得到方差分析所需检验统计量的分布. 相似文献
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Ruimei Gao & Donghe Pei 《数学研究通讯:英文版》2013,29(3):231-238
This paper mainly gives a sufficient and necessary condition for an order
of hyperplanes of a graphic arrangement being supersolvable. In addition, we give
the relations between the set of supersolvable orders of hyperplanes and the set of
quadratic orders of hyperplanes for a supersolvable arrangement. 相似文献
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Gunter Malle 《Journal of Number Theory》2002,92(2):315-329
We propose a conjecture on the distribution of number fields with given Galois group and bounded norm of the discriminant. This conjecture is known to hold for abelian groups. We give some evidence relating the general case to the composition formula for discriminants, give a heuristic argument in favor of the conjecture, and present some computational data. 相似文献
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Jürgen Herzberger 《BIT Numerical Mathematics》1999,39(2):366-372
Solving a practical problem in the calculation of the effective rate (of interest) of an ordinary annuity leads to new tight bounds for the positive root of a class of polynomials. This result may also be applied to the calculation of the rate-of-convergence for interpolatory iteration methods of rootfinding which involve the same kind of polynomial equations like the ordinary annuities. 相似文献
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T. Rapcsák 《Journal of Optimization Theory and Applications》2005,127(1):177-191
The Fenchel problem of level sets in the smooth case is solved by deducing a new and nice geometric necessary and sufficient
condition for the existence of a smooth convex function with the level sets of a given smooth pseudoconvex function. The main
theorem is based on a general differential geometric tool, the space of paths defined on smooth manifolds. This approach provides
a complete geometric characterization of a new subclass of pseudoconvex functions originating from analytical mechanics and
a new view on convexlike and generalized convexlike mappings in image analysis.
This paper is dedicated to the memory of Guido Stampacchia.
The author thanks K. Balla for assistance in solving the system of differential equations of Example 2.1 and for helpful remarks.
This research was supported in part by the Hungarian Scientific Research Fund, Grants OTKA-T043276 and OTKA-T043241, and by
CNR, Rome, Italy.
An erratum to this article is available at . 相似文献
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通过对图书馆运行机理与信息管理中网络关系的分析 ,结合局域网设计要求 ,把网络优化模型应用到图书馆管理中 ,建立了集图书馆管理、服务、文献优化配置、资金预算、资金分配、事务调查和咨询于一体的、系统的网络管理优化模型 .经过在图书馆中的实际应用 ,获得了好的效果 . 相似文献
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本文设计了一种矸石堆的成堆方法 :在堆积若干年之后 ,后移一定距离重新堆积并将之前的矸石堆覆盖 ,这一方法在文 [1 ]的基础上使电费的值继续减少 ,并计算了两次成堆情况下不同出矸率对应的电费值 . 相似文献
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R. P. Agarwal 《Journal of Optimization Theory and Applications》1982,36(1):139-144
We show that, like the method of adjoints, the method of complementary functions can be effectively used to solve nonlinear boundary-value problems.This work was supported by the Alexander von Humboldt Foundation. The author is thankful to Prof. G. Hämmerlin for providing the facilities and to Miss J. Gumberger for performing numerical tests. The author is also indebted to Dr. S. M. Roberts for his suggestions on the first draft of this paper. 相似文献
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T. Radzik 《Journal of Optimization Theory and Applications》1988,58(3):473-500
The paper considers a game of timing which is closely related to the so-called duels. This is a game connected with the distribution of resources by two players. Each of the players is in possession of some amount of resource to be distributed by him in the time interval [0, 1]. In his behavior, Player 1 is restricted by the necessity of taking all of his resources at a single point, while Player 2 has no restrictions. For the payoff function, defined as for duels, the game is solved; explicit formulas on the value of the game and the optimal strategies for the players are found. 相似文献
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Xu Yumei 《高校应用数学学报(英文版)》2006,21(4):437-453
This paper deals with the asymptotic behavior of the life-span of classical solutions to Cauchy problem for general first order quasilinear strictly hyperbolic systems in two independent variables with weaker decaying initial data, and obtains a blow-up result for C1 solution to Cauchy problem. 相似文献
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This paper establishes the exact multiplicities and properties of positive solutions for some second order differential equations involving p-Laplacian operator. 相似文献
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Evald Übi 《Central European Journal of Mathematics》2007,5(2):373-385
The system of inequalities is transformed to the least squares problem on the positive ortant. This problem is solved using
orthogonal transformations which are memorized as products. Author’s previous paper presented a method where at each step
all the coefficients of the system were transformed. This paper describes a method applicable also to large matrices. Like
in revised simplex method, in this method an auxiliary matrix is used for the computations. The algorithm is suitable for
unstable and degenerate problems primarily.
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Richard C. Bradley 《Statistics & probability letters》2011,81(12):1823-1826
In a paper in 1956, Dobrushin proved a central limit theorem for triangular arrays of Markov chains under certain dependence assumptions somewhat related to “Doeblin’s condition”. In a very recent paper, Peligrad proved a central limit theorem of the same type, but with dependence assumptions based on maximal correlations. This note here will give a concrete example to illustrate the extent to which Peligrad’s result goes beyond that of Dobrushin. 相似文献