共查询到19条相似文献,搜索用时 78 毫秒
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本文介绍了结构多项式性研究中用的一些方法,包括能行对角线方法,能行有穷延伸法,填料法,间隙法,延迟对角线法,加速法。 相似文献
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最近,Zhao和Sun提出了一个求解sufficient线性互补问题的高阶不可行内点算法.不需要严格互补解条件,他们的算法获得了高阶局部收敛率,但他们的文章没有报告多项式复杂性结果.本文我们考虑他们所给算法的一个简化版本,即考虑求解单调水平线性互补问题的一个高阶可行内点算法.我们证明了算法的迭代复杂性是 相似文献
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最近Peng等人使用新的搜索方向和自正则度量为求解线性规划问题提出了一个原始对偶内点法.本文将这个长步法延伸到凸二次规划.在线性规划情形时,原始空间和对偶空间中的尺度Newton方向是正交的,而在二次规划情形时这是不成立的.本文将处理这个问题并且证明多项式复杂性,并且得到复杂性的上界为O(n√log n log (n/ε)). 相似文献
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关于微分多项式的一些结果 总被引:3,自引:0,他引:3
设f是平面内超越亚纯函数,满足N(r,f)=S(r,f).P[f]是f的多项式,Q[f]是f的微分多项式。本文考虑了形如P[f]f'+Q[f](特殊情形为f ̄nf'+Q[f]及P[f]f'-C,C为常数)的微分多项式的值分布,推广并改进了W.K.Hayman,J.Clunie,E.Mues等人关于整函数的一些结果。 相似文献
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本文证明了Morgan-Voyce多项式的零点在闭区间$[-4,0]$上是稠密的.本文也证明了Morgan-Voyce多项式系数的分布是渐近正态的,以及它的系数矩阵是全正的. 相似文献
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设Bm(f,·)为函数f在d维单纯形σ上的n阶Bernstein多项式,本文对f∈Cr(σ)及f∈Cr+2(σ)给出了f的各阶编导数用Bn(f,·)相应偏导数逼近的误差估计.同时也考虑了整系数Bernstein多项式的Lp模估计 相似文献
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Goss和冯克勤证明了:对q≥2,Fq[T]中存在无穷多不正规的不可约多项式。Ireland和Small给出了第n个Bernoulli-Goss多项式(1≤n≤p2—1)的明确表达式,利用这个结果,他们对于3≤p≤269求出所有形为T2—a(a∈FP[T])的正规二次不可约多项式。本文对n有两项q-adic展开的情形,给出Fq[T]中第n个Bernoulli-Goss多项式的明确表达式。由此证明了:对任意q≥3,Fq[T]中存在无穷多不可约多项式同时是第一类和第二类不正规的,我们还给出二次不可约多项式正规性的一些等价条件。基于文献[3]中的计算结果,我们决定出特征不超过269的所有Fq[T]中二次正规不可约多项式。 相似文献
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Valeriy K. Bulitko 《Mathematical Logic Quarterly》1999,45(4):561-571
We apply complexity concepts to define a new sort of sub-Turing reducibilities ≤ ?? make the degree hierarchy thinner and to obtain some new specifications of the well known jump inversion theorem of Friedberg. We show that this theorem doesn't hold when ≤ T is replaced with ≤ ??, where ?? is any countable subset of the class ?? of all total increasing functions f : ? → ?. 相似文献
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《Journal of Complexity》1997,13(3):303-325
In this paper, we survey some of our new results on the complexity of a number of problems related to polynomial ideals. We consider multivariate polynomials over some ring, like the integers or the rationals. For instance, a polynomial ideal membership problem is a (w+ 1)-tupleP= (f,g1,g2, …gwwherefand thegiare multivariate polynomials, and the problem is to determine whetherfis in the ideal generated by thegi. For polynomials over the integers or rationals, this problem is known to be exponential space complete. We discuss further complexity results for problems related to polynomial ideals, like the word and subword problems for commutative semigroups, a quantitative version of Hilbert's Nullstellensatz in a complexity theoretic version, and problems concerning the computation of reduced polynomials and Gröbner bases. 相似文献
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The class of rudimentary predicates is defined as the smallest class of numerical predicates that contains the equality and concatenation predicates and is closed under the operations of propositional logic, explicit transformations, and bounded quantification. Two classes of rudimentary predicates are considered. The first of them consists of the predicates whose prenex normal form of a special type has the quantifier prefix of the form
. Predicates of the second class can have an arbitrary quantifier prefix, but restrictions are imposed on the Skolem deciding functions. It is proved that any predicate from each of these classes can be computed by a suitable deterministic algorithm in polynomial time. 相似文献
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Kate Copestake 《Mathematical Logic Quarterly》1997,43(3):287-310
Enumeration reducibility is a notion of relative computability between sets of natural numbers where only positive information about the sets is used or produced. Extending e-reducibility to partial functions characterises relative computability between partial functions. We define a polynomial time enumeration reducibility that retains the character of enumeration reducibility and show that it is equivalent to conjunctive non-deterministic polynomial time reducibility. We define the polynomial time e-degrees as the equivalence classes under this reducibility and investigate their structure on the recursive sets, showing in particular that the pe-degrees of the computable sets are dense and do not form a lattice, but that minimal pairs exist. We define a jump operator and use it to produce a characterisation of the polynomial hierarchy. 相似文献
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Maziar Salahi Tamás Terlaky Guoqing Zhang 《Computational Optimization and Applications》2006,33(2-3):157-185
Primal-Dual Interior-Point Methods (IPMs) have shown their power in solving large classes of optimization problems. In this
paper a self-regular proximity based Infeasible Interior Point Method (IIPM) is proposed for linear optimization problems.
First we mention some interesting properties of a specific self-regular proximity function, studied recently by Peng and Terlaky,
and use it to define infeasible neighborhoods. These simple but interesting properties of the proximity function indicate
that, when the current iterate is in a large neighborhood of the central path, large-update IIPMs emerge as the only natural
choice. Then, we apply these results to design a specific self-regularity based dynamic large-update IIPM in large neighborhood.
The new dynamic IIPM always takes large-updates and does not utilize any inner iteration to get centered. An
worst-case iteration bound of the algorithm is established. Finally, we report the main results of our computational experiments. 相似文献
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Karel Dekimpe 《Geometriae Dedicata》2002,93(1):47-56
We study polynomial crystallographic actions on the plane. These are properly discontinuous and cocompact actions, which are expressed by polynomial functions. We prove that any such action of a polycyclic-by-finite group is of bounded degree and conversely that any polynomial crystallographic action of bounded degree comes from a polycyclic-by-finite group. This last result is a generalization of the well known Auslander conjecture. 相似文献
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Dorit S. Hochbaum 《Annals of Operations Research》2007,153(1):257-296
Nonlinear optimization algorithms are rarely discussed from a complexity point of view. Even the concept of solving nonlinear
problems on digital computers is not well defined. The focus here is on a complexity approach for designing and analyzing
algorithms for nonlinear optimization problems providing optimal solutions with prespecified accuracy in the solution space.
We delineate the complexity status of convex problems over network constraints, dual of flow constraints, dual of multi-commodity,
constraints defined by a submodular rank function (a generalized allocation problem), tree networks, diagonal dominant matrices,
and nonlinear knapsack problem’s constraint. All these problems, except for the latter in integers, have polynomial time algorithms
which may be viewed within a unifying framework of a proximity-scaling technique or a threshold technique. The complexity of many of these algorithms is furthermore best possible in that it matches lower bounds on the
complexity of the respective problems.
In general nonseparable optimization problems are shown to be considerably more difficult than separable problems. We compare
the complexity of continuous versus discrete nonlinear problems and list some major open problems in the area of nonlinear
optimization.
An earlier version of this paper appeared in 4OR, 3:3, 171–216, 2005. 相似文献