ω,q-Bernstein多项式的Voronovskaya-型公式

讨论了ω,q-Bernstein多项式的Voronovskaya-型公式及其收敛的饱和性.给出了当01[0,1]时ω,q-Bernstein多项式的Voronovskaya-型公式.如果0<ω,q<1,f∈C1[0,1]时ω,q-Bernstein多项式的Voronovskaya-型公式.如果0<ω,q<1,f∈C¹[0,1],则ω,q-Bernstein多项式的收敛阶为o(q1[0,1],则ω,q-Bernstein多项式的收敛阶为o(qⁿ)当且仅当((f(1-qn)当且仅当((f(1-q^(k-1)-f(1-q)(k-1)-f(1-q)^k))/((1-qk))/((1-q^(k-1)-(1-q(k-1)-(1-q^k)))=f'(1-qk)))=f'(1-q^k),k=1,2,…还证明f如果f在[0,1]是凸的或者在(-ε,1+ε)(ε>0)解析,则ω,q-Bernstein多项式的收敛阶为o(qk),k=1,2,…还证明f如果f在[0,1]是凸的或者在(-ε,1+ε)(ε>0)解析,则ω,q-Bernstein多项式的收敛阶为o(qⁿ)当且仅当f是线性函数.     

关于多项式的Waring问题（Ⅱ）

设ｆ＿ｌ（ｘ）是首项系数为正的ｌ次整系数多项式，满足条件：不存在整数ｄ，ｑ＞１使得ｆ＿ｌ（ｘ）≡ｄ（ｍｏｄｑ）对所有ｘ成立．记Ｒ＿ｋ（ｎ）为方程的正整数的解数，本文的主要结果是：对于及充分大的ｎ，我们有Ｒ＿ｋ（ｎ）》这是Ｖａｕｇｈａｎ关于Ｗａｒｉｎｇ问题的一个结果对多项式的推广。     

关于q—Bernstein多项式及其Boole和迭代

本文对q-Bernstein多项式Bn(f,q,x)收敛于B∞(f,q,x)的加速问题进行研究,同时对其Boolean和迭代的收敛性问题进行考虑.采用精细估计,并应用光滑模理论等手段,得到相应的逼近速度估计.结果表明:q-Bernstein多项式在这两个问题上与传统Bernstein多项式有着类似的结果.     

三变量中的一类坐标多项式

In this paper,we introduce a polynomial sequence in K[x],in which two neigh- bor polynomials satisfy a wonderful property.Using that,we give partial answer of an open problem:ifφ(x,y,z)=(f(x,y),g(x,y,z),z),which sends every linear coordinate to a coor- dinate,thenφis an automorphism of K[x,y,z].As a byproduct,we give an easy proof of the welt-known Jung's Theorem.     

多项式分裂可行问题

本文研究多项式分裂可行问题,即由多项式不等式定义的分裂可行问题,包括凸与非凸、可行与不可行的问题;给出多项式分裂可行问题解集的半定松弛表示;研究其半定松弛化问题的性质;并基于这些性质建立求解多项式分裂可行问题的半定松弛算法.本文在较为一般的条件下证明了,如果分裂可行问题有解,则可通过本文建立的算法求得一个解点;如果问题...     

关于Lucas多项式平方和的恒等式

利用广义Lucas多项式L n(x,y)的性质,通过构造组合和式T n(x,y;tx2),结合Bernoulli多项式的生成函数和Euler多项式的生成函数,采用分析学中的方法,得到两个有关L2n(x,y)的恒等式.并从这一结果出发,得到了两个推论,推广了相关文献的一些结果.     

CONVERGENCE OF DERIVATIVES OF GENERALIZED BERNSTEIN OPERATORS

In the present paper, we obtain estimations of convergence rate derivatives of the q-Bernstein polynomials Bn (f, qn ; x) approximating to f ′ (x) asn →∞, which is a generalization of that relating the classical case qn = 1. On the other hand, we study the convergence properties of derivatives of the limit q-Bernstein operators B ∞ (f, q; x) as q → 1- .     

On Pointwise Convergence of q-Bernstein Operators and Their q-Derivatives

Pointwise convergence of q-Bernstein polynomials and their q-derivatives in the case of 0 < q < 1 is discussed. We study quantitative Voronovskaya type results for q-Bernstein polynomials and their q-derivatives. These theorems are given in terms of the modulus of continuity of q-derivative of f which is the main interest of this article. It is also shown that our results hold for continuous functions although those are given for two and three times continuously differentiable functions in classical case.     

关于Bernstein多项式的绝对收敛性

该文研究Ｂｅｒｎｓｔｅｉｎ多项式的绝对收敛性．证明了，对每个ｘ∈［０，１］，一个有界变差函数的Ｂｅｒｎｓｔｅｉｎ多项式序列是绝对｜Ｃ，１｜可和的，而且给出了Ｂｅｒｓｔｅｉｎ多项式序列的绝对｜Ｃ，１｜和式的余项的估计．     

Positive Values of Polynomials

Mathematical Notes -     

关于多项式多重卷积利用差分与移位算子的计值法

Here concerned and further investigated is a certain operator method for the computation of convolutions of polynomials. We provide a general formulation of the method with a refinement for certain old results, and also give some new applications to convolved sums involving several noted special polynomials. The advantage of the method using operators is illustrated with concrete examples. Finally, also presented is a brief investigation on convolution polynomials having two types of summations.     

三对角行列式与Chebyshev多项式

给出了三对角行列式的几种算法,利用三对角行列式证明了两类Chebyshev多项式的几种显式.     

Bernoulli多项式的积分多项式

首次研究了 Bernoulli多项式的积分多项式 .首先 ,给出这类多项式的定义和基本性质 ;其次 ,建立两类幂和多项式的相互关系 ;最后 ,介绍上述结果在求解自然数幂和公式方面的应用 .     

Euler多项式的若干对称恒等式

Using the generating functions, we prove some symmetry identities for the Euler polynomials and higher order Euler polynomials, which generalize the multiplication theorem for the Euler polynomials. Also we obtain some relations between the Bernoulli polynomials, Euler polynomials, power sum, alternating sum and Genocchi numbers.     

Polynomials in

A positive semidefinite polynomial is said to be if is a sum of squares in , but no fewer, and is a sum of squares in , but no fewer. If is not a sum of polynomial squares, then we set .

It is known that if , then . The Motzkin polynomial is known to be . We present a family of polynomials and a family of polynomials. Thus, a positive semidefinite polynomial in may be a sum of three rational squares, but not a sum of polynomial squares. This resolves a problem posed by Choi, Lam, Reznick, and Rosenberg.