共查询到20条相似文献,搜索用时 15 毫秒
1.
《系统科学与复杂性》2017,(1)
Gr?bner basis theory for parametric polynomial ideals is explored with the main objective of mimicking the Gr?bner basis theory for ideals. Given a parametric polynomial ideal, its basis is a comprehensive Gr?bner basis if and only if for every specialization of its parameters in a given field, the specialization of the basis is a Gr?bner basis of the associated specialized polynomial ideal.For various specializations of parameters, structure of specialized ideals becomes qualitatively different even though there are significant relationships as well because of finiteness properties. Key concepts foundational to Gr?bner basis theory are reexamined and/or further developed for the parametric case:(i) Definition of a comprehensive Gr?bner basis,(ii) test for a comprehensive Gr?bner basis,(iii) parameterized rewriting,(iv) S-polynomials among parametric polynomials,(v) completion algorithm for directly computing a comprehensive Gr?bner basis from a given basis of a parametric ideal. Elegant properties of Gr?bner bases in the classical ideal theory, such as for a fixed admissible term ordering,a unique Gr?bner basis can be associated with every polynomial ideal as well as that such a basis can be computed from any Gr?bner basis of an ideal, turn out to be a major challenge to generalize for parametric ideals; issues related to these investigations are explored. A prototype implementation of the algorithm has been successfully tried on many examples from the literature. 相似文献
2.
Deepak Kapur 《系统科学与复杂性》2017,30(1):196-233
Gröbner basis theory for parametric polynomial ideals is explored with the main objective of mimicking the Gröbner basis theory for ideals. Given a parametric polynomial ideal, its basis is a comprehensive Gröbner basis if and only if for every specialization of its parameters in a given field, the specialization of the basis is a Gröbner basis of the associated specialized polynomial ideal. For various specializations of parameters, structure of specialized ideals becomes qualitatively different even though there are significant relationships as well because of finiteness properties. Key concepts foundational to Gröbner basis theory are reexamined and/or further developed for the parametric case: (i) Definition of a comprehensive Gröbner basis, (ii) test for a comprehensive Gröbner basis, (iii) parameterized rewriting, (iv) S-polynomials among parametric polynomials, (v) completion algorithm for directly computing a comprehensive Gröbner basis from a given basis of a parametric ideal. Elegant properties of Gröbner bases in the classical ideal theory, such as for a fixed admissible term ordering, a unique Gröbner basis can be associated with every polynomial ideal as well as that such a basis can be computed from any Gröbner basis of an ideal, turn out to be a major challenge to generalize for parametric ideals; issues related to these investigations are explored. A prototype implementation of the algorithm has been successfully tried on many examples from the literature. 相似文献
3.
ONTHEALGEBRAICVARIETYDECOMPOSITIONWUJinzhao(InstituteofSystemsScience,AcademiaSinica,Beijing100080,China)ONTHEALGEBRAICVARIET... 相似文献
4.
THE MINIMAL CHARACTERISTIC BASIS OF A POLYNOMIAL IDEAL 总被引:1,自引:0,他引:1
高小山 《系统科学与复杂性》1989,(3)
The concept of minimal characteristic basis(abbr.char basis) of a polynomial ideal ispresened to give the uniqueness of the char basis of an ideal.For the prime ideal,we give an algorithmto construct the minimal char basis from generators of the given ideal. 相似文献
5.
WANG Mingsheng 《系统科学与复杂性》2002,(4)
Hong's theorem for Grobner bases under polynomial composition is generalized to module case with more general cosideration. Similar generalization is also considered when the coefficient field is replaced by a Dedekind domain. 相似文献
6.
WANG Yuzhen 《系统科学与复杂性》2002,(4)
Using Carleman linearization procedure, this paper investigates the problem of first integrals of polynomial autonomous systems and proposes a procedure to find the first integrals of polynomial family for the systems. A generalized eigenequation is obtained and then the problem is reduced to the solvability of the eigenequation. The result is a generalization of some known results. 相似文献
7.
研究有限域(定义在GF(2)上的m维向量空间)的正规基乘法器。基于域元素的正规基表示和多项式基表示可以相互转换,通过分析多项式基下的乘法运算公式,得到利于串行乘法器设计的有效性质。利用该性质,提出了一个新的串行正规基乘法器,该乘法器要求(2m-2)个二值输入的异或门,m个二值输入的与门。在进行具体的硬件实现时,所需要的存储空间为3m+1。 相似文献
8.
This paper presents a criterion for testing the irreducibility of a polynomial over an algebraic extension field. Using this
criterion and the characteristic set method, the authors give a criterion for testing whether certain difference ascending
chains are strong irreducible, and as a consequence, whether the saturation ideals of these ascending chains are prime ideals. 相似文献
9.
COHERENT, REGULAR AND SIMPLE SYSTEMS IN ZERO DECOMPOSITIONS OF PARTIAL DIFFERENTIAL SYSTEMS 总被引:1,自引:0,他引:1
LI Ziming 《系统科学与复杂性》1999,(Z1)
1.IntroductionWeareconcernedwithalgebraicdifferentialpolynomials(abbreviatedas'd-pcis)inafinitenumberofdifferentialindeterminatesoveradifferentialfieldofcharacteristic0.Givenafinitesetofsuchd-pcis,wewouldliketostudyd-Zero(),thedifferentialalgebraicsetdefinedbyPoverauniversaldifferentialfield.Wemayaskwhetherd-Zero()isempty,whetherad-pcivanishesond-Zero()(differentialradicalidealmembershipproblem),whatthedimensionofd-Zero()is,howtodecomposed-Zero()intoirreduciblealgebraicdifferentialsets,andso… 相似文献
10.
WUWenjun 《系统科学与复杂性》2004,17(2):153-163
The char-set method of polynomial equations-solving is naturally extended to the differential case which gives rise to an algorithmic method of solving arbitrary systems of algebrico-differential equations. As an illustration of the method, the Devil's Problem of Pommaret is solved in details. 相似文献
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12.
LIUJinwang HOUJinjun PENGZhenyun CAOWensheng 《系统科学与复杂性》2005,18(3):375-382
Composition is the operation of replacing variables in a polynomial with other polynomials. The main question in this paper is: when does composition commute with universal Groebner basis computation? We prove that this happens iff the composition is single variable. This has a natural application in the computation of universal Groebner bases of composed polynomials. 相似文献
13.
Jinwang LIU Dongmei LI Xiaosong CHEN 《系统科学与复杂性》2007,20(4):610-613
Polynomial composition is the operation of replacing variables in a polynomial with other polynomials. λ-Grgbner basis is an especial Grobner basis. The main problem in the paper is: when does composition commute with λ-Grobner basis computation? We shall answer better the above question. This has a natural application in the computation of λ-Grobner bases. 相似文献
14.
This paper investigates the termination problems of multi-path polynomial programs (MPPs) with equational loop guards. To establish sufficient conditions for termination and nontermination simultaneously, the authors propose the notion of strong/weak non-termination which under/over- approximates non-termination. Based on polynomial ideal theory, the authors show that the set of all strong non-terminating inputs (SNTI) and weak non-terminating inputs (WNTI) both correspond to tile real varieties of certain polynomial ideals. Furthermore, the authors prove that the variety of SNTI is computable, and under some sufficient conditions the variety of WNTI is also computable. Then by checking the computed SNTI and WNTI varieties in parallel, termination properties of a consid- ered MPP can be asserted. As a consequence, the authors establish a new framework for termination analysis of MPPs. 相似文献
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16.
WU Jinzhao 《系统科学与复杂性》1996,(3)
QUANTITATIVEPROPERTIESOFGREENEQUIVALENCESONSPECIALMONOIDSWUJinzhao(InstituteofSystemsScience,AcademiaSinica,Beijing100080,Chi... 相似文献
17.
In this paper, the so-called invertibility is introduced for rational univariate representations, and a characterization of the invertibility is given. It is shown that the rational univariate representations, obtained by both Rouillier’s approach and Wu’s method, are invertible. Moreover, the ideal created by a given rational univariate representation is defined. Some results on invertible rational univariate representations and created ideals are established. Based on these results, a new approach is presented for decomposing the radical of a zero-dimensional polynomial ideal into an intersection of maximal ideals.
相似文献18.
STABILITY OF SWITCHED POLYNOMIAL SYSTEMS 总被引:1,自引:0,他引:1
This paper investigates the stability of (switched) polynomial systems. Using semi-tensor product of matrices, the paper develops two tools for testing the stability of a (switched) polynomial system. One is to convert a product of multi-variable polynomials into a canonical form, and the other is an easily verifiable sufficient condition to justify whether a multi-variable polynomial is positive definite. Using these two tools, the authors construct a polynomial function as a candidate Lyapunov function and via testing its derivative the authors provide some sufficient conditions for the global stability of polynomial systems. 相似文献
19.
ON SUFFICIENT AND NECESSARY OF EXISTENCE FOR A CLASS OF SINGULAR OPTIMAL STOCHASTIC CONTROL 总被引:5,自引:0,他引:5
LIUKunhui QINMingda LUChuanlai 《系统科学与复杂性》2003,16(4):424-437
We study a class of discounted models of singular stochastic control. In this kind of models, not only the structure of cost function has been extended to some general type, but also the state can be represented as the solution of a class of stochastic differential equations with nonlinear drift and diffusion term. By the various methods of stochastic analysis, we derive the sufllcient and necessary conditions of the existence of optimal control. 相似文献
20.
YANG Xiaojing 《系统科学与复杂性》1997,(1)
1.IntroductionT.Dated]obtainedanalgebraicclassificationofplanehomogeneousquadraticvectorfields,A.Cima[2]gaveanalgebraicandtopologicalclassificationofhomogeneouscubicvectorfieldsintheplane.Theirmethodswerebasedontheclassificationofforth-orderbinaryformsdev… 相似文献