共查询到20条相似文献,搜索用时 78 毫秒
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应用实系数多项式的性质构造了一类满足Turan型不等式的多项式序列,证明了该多项式序列的几个性质,并给出了一些应用. 相似文献
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对于一元实系数多项式的实根问题,运用斯图姆(Sturm)方法不仅可以确定其实根的个数以及正负根的个数,而且对于任意给定的区间(a,b)可以确定这个多项式在此区间内实根的个数,但是对于一元复系数多项式呢?本文给出一般方法把一元复系数多项式的实根问题归 相似文献
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本文给出并严格证明了"一元实系数偶数(≥2)次多项式函数有极值"这一定理,并对多项式函数的次数及最高次项系数的符号与极值点的关系进行了归纳. 相似文献
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对于一个系数在可计算序域上的多元多项式方程 ,给出了该方程有实解的两个判别定理 .在此基础上研究了二元多项式 ,从而给出了判定二元多项式的实零点存在性以及半定性的有效方法 .此外 ,藉助于计算机 ,处理了几个有关实例 .处理手段是 :通过无限小量的引进 ,将问题所涉及的系数域扩充为一个可计算的非Archimedes序域 . 相似文献
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对于1’>O,如果了(劣)~‘扩+‘一:扩一’十…十al劣+a0是复系数一元:次多项式,那么方程f(:)二。,即 a·‘,+‘一、‘,一‘+…+a,:+a。=0②①叫做复系数一元二次方程.方程②的根,也称多项式① 的根. 一27一中学数学(湖北)1992.12 类似地,如果j(,)是实系数(或有理系数、整系数等)一元:(、>0)次多项式,那么方程j(幻二O叫做实系数(或有理系数、整系数等)一元:次方程. 关于多项式的根的个数有以下重要定理: l代数墓本定理一元:次多项式在复数集中至少有一个根. :799年伟大的数学家高斯证明了这一重要定理· 2根的个数定理一元二次多项式有且仅有… 相似文献
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实系数二元二次多项式可实分解的条件及其操作 总被引:1,自引:0,他引:1
实系数二元二次多项式可实分解的条件及其操作430062湖北大学林六十安系数二元二次多项式可实分解的条件已有不少论述,但一般都是判定定理.如何分解?未加阐述.本文给出一个简易的又便于操作的判定定理.定理当且仅当方程al’一hi+c。0(a一0)和as’... 相似文献
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用特征方程解二元二次方程组 总被引:2,自引:0,他引:2
用特征方程解二元二次方程组胡圣团(津市职业中专学校415400)为了下面的需要,我们先讨论一下实系数二元二次多项式的复分解问题.设是一实系数二元二次多项式.由解析几何理论知识,如何g(x,y)能解,则二次曲线g(x,y)=0是退化的,即曲线上有奇点,... 相似文献
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Ⅰ 引言 设是首项系数为1的实系数或复系数的n次多项式Durand和Kerner独立地提出了求(1)的所有根r_1,…,r_n的并行算法: 相似文献
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V. V. Karachik 《Computational Mathematics and Mathematical Physics》2011,51(9):1567-1587
A polynomial solution of the inhomogeneous Dirichlet problem for Poisson’s equation with a polynomial right-hand side is found.
An explicit representation of the harmonic functions in the Almansi formula is used. The solvability of a generalized third
boundary value problem for Poisson’s equation is studied in the case when the value of a polynomial in normal derivatives
is given on the boundary. A polynomial solution of the third boundary value problem for Poisson’s equation with polynomial
data is found. 相似文献
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Akihito Ebisu 《Mathematische Nachrichten》2014,287(2-3):210-215
We consider a reducible generalized hypergeometric equation, whose sub‐equation possesses apparent singular points. We determine the polynomial whose roots are these points. We show that this polynomial is a generalized hypergeometric polynomial. 相似文献
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In this paper we consider the initial problem with an initial point for a scalar linear inhomogeneous differential-difference equation of neutral type. For polynomial coefficients in the equation we introduce a formal solution, representing a polynomial of a certain degree (“a polynomial quasisolution”); substituting it in the initial equation, one obtains a residual. The work is dedicated to the definition and the analysis (on the base of numerical experiments) of polynomial quasisolutions for the solutions of the initial problem under consideration. 相似文献
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V. E. Kruglov 《Differential Equations》2008,44(7):1029-1032
For given particular polynomial solutions, we construct polynomial coefficients of a second-order differential equation. We obtain a criterion for the equation in question to have two solutions of the form \(u_i (t) = a_i t^{\varrho _i } + t^{\varrho _i - 1} \). Under certain restrictions on the parameters, polynomial solutions of the Heun equation are given. 相似文献
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Data classification is an important area of data mining. Several well known techniques such as decision tree, neural network, etc. are available for this task. In this paper we propose a Kalman particle swarm optimized (KPSO) polynomial equation for classification for several well known data sets. Our proposed method is derived from some of the findings of the valuable information like number of terms, number and combination of features in each term, degree of the polynomial equation etc. of our earlier work on data classification using polynomial neural network. The KPSO optimizes these polynomial equations with a faster convergence speed unlike PSO. The polynomial equation that gives the best performance is considered as the model for classification. Our simulation result shows that the proposed approach is able to give competitive classification accuracy compared to PNN in many datasets. 相似文献
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Real-root property of the spectral polynomial of the Treibich–Verdier potential and related problems
Zhijie Chen Ting-Jung Kuo Chang-Shou Lin Kouichi Takemura 《Journal of Differential Equations》2018,264(8):5408-5431
We study the spectral polynomial of the Treibich–Verdier potential. Such spectral polynomial, which is a generalization of the classical Lamé polynomial, plays fundamental roles in both the finite-gap theory and the ODE theory of Heun's equation. In this paper, we prove that all the roots of such spectral polynomial are real and distinct under some assumptions. The proof uses the classical concept of Sturm sequence and isomonodromic theories. We also prove an analogous result for a polynomial associated with a generalized Lamé equation, where we apply a new approach based on the viewpoint of the monodromy data. 相似文献
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Pedro J. Torres 《Journal of Mathematical Analysis and Applications》2007,328(2):1108-1116
We find new criteria for the existence of closed solutions in a first order polynomial differential equation which contains the Abel equation as a particular case. Such results are applied to the problem of the existence of limit cycles in planar polynomial vector fields. 相似文献
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In this study, we employ Pascal polynomial basis in the two-dimensional Berger equation, which is a fourth order partial differential equation with applications to thin elastic plates. The polynomial approximation method based on Pascal polynomial basis can be readily adapted to obtain the numerical solutions of partial differential equations. However, a drawback with the polynomial basis is that the resulting coefficient matrix for the problem considered may be ill-conditioned. Due to this ill-conditioned behavior, we use a multiple-scale Pascal polynomial method for the Berger equation. The ill-conditioned numbers can be mitigated using this approach. Multiple scales are established automatically by selecting the collocation points in the multiple-scale Pascal polynomial method. This method is also a meshless method because there is no requirement to establish complex grids or for numerical integration. We present the solutions of six linear and nonlinear benchmark problems obtained with the proposed method on complexly shaped domains. The results obtained demonstrate the accuracy and effectiveness of the proposed method, as well showing its stability against large noise effects. 相似文献
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V. V. Karachik 《Computational Mathematics and Mathematical Physics》2014,54(7):1122-1143
An algorithm is proposed for the analytical construction of a polynomial solution to Dirichlet problem for an inhomogeneous polyharmonic equation with a polynomial right-hand side and polynomial boundary data in the unit ball. 相似文献