一个推广的具有最佳常数的Hardy-Hilbert 积分不等式

本文引入适当的参数,建立一个推广的,具有最佳常数的Hardy-Hilbert积分不等式,并考虑了它的更一般形式.     

On the Best Possible Constants in the Khintchine Inequality for P >= 3

In the paper the best constants in the Khintchine inequalityfor p 3 are found, namely where . This gives stronger estimates than the hitherto Known ones forthe constants depend on n.     

Again Sharpening of a Negative ExponentGeometric Inequality in the Space E~n

DerinitionInageometricinequalitybyaftersimplify,ifturnupgeometricmetricinde-nominatorofafractor,butnoturnupgeometricmetricinnumerator,thencallednegativeex-ponentgeometricinequalitysuchgeometicinequality,isnegativeexponentgecmetricinequalityforshort-LetrandR.denotetheinradiusandcircumradiusofsimplexXinthen-dimensionalEuc-tideanspaceEw,respectively.LetPbearbitraryPOintinsidethe8implexX,andd,,d,,..',d. ,bethedistancefrompointPton lthen-l-dimensionalhyperplane,article[ljobtainanegativeexponent…     

Equivalence of the Local Markov Inequality and a Kolmogorov Type Inequality in the Complex Plane

We prove that a compact subset of the complex plane satisfies a local Markov inequality if and only if it satisfies a Kolmogorov type inequality. This result generalizes a theorem established by Bos and Milman in the real case. We also show that every set satisfying the local Markov inequality is a sum of Cantor type sets which are regular in the sense of the potential theory.     

一个推广的具有最佳常数的Hardy-Hilbert不等式

本文的目的是建立新的具有最佳常数因子的Hardy-Hilbert不等式的推广式．对二重级数适当配方,利用Hlder不等式及β-函数,得到下面的推广式：∑_(m=1)~∞∑_(n=1)~∞((a_nb_n)/(m~c n~c)■)＜cλ,p(∑n~((P-1)(1-λ))a_n~p)~(1/p)(∑n~((q-1)(1-λ))b_n~q)~(1/q),这里λ＞0,c＞0,p＞1,(1/p) (1/q)=1,a_n≥0,b_n≥0,cλ,p=(1/c)B((λ/cp),(λ/cq)),通过选取两个特殊序列,证明了常数因子cλ,p是最佳的；还给出了它的等价形式,用类似方法给出了重积分形式的Hardy-Hilbert不等式的推广式及其等价形式．     

一个推广的具最佳常数的多参数Hardy-Hilbert不等式

引入λ1,λ2,α等多个参数,利用权系数方法,给出了一个推广的具最佳常数的多参数Hardy-Hilbert重级数不等式,并给出其等价形式.     

On the Converse Inequality of Markov Type inL2Norm

The converse inequality of Markov type is discussed in this note. The main result says that the best possible constant for this inequality is the square root of the least eigenvalue of a certain positive definite matrix. As applications of the main result, the Laguerre weight and Hermite weight are investigated in detail, and the best constants in these two cases are obtained explicitly.     

Some Best Constants in the Landau Inequality on a Finite Interval

An additive form of the Landau inequality forf∈Wⁿ_∞[−1, 1],is proved for 0<c?(cos(π/2n))⁻², 1?m?n−1, with equality forf(x)=T_n(1+(x−1)/c), 1?c?(cos(π/2n))⁻², whereT_nis the Chebyshev polynomial. From this follows a sharp multiplicative inequality,for ‖f⁽ⁿ⁾‖?σ ‖f‖, 2ⁿ⁻¹n! cos²ⁿ(π/2n)?σ?2ⁿ⁻¹n!, 1?m?n−1. For these values ofσ, the result confirms Karlin's conjecture on the Landau inequality for intermediate derivatives on a finite interval. For the proof of the additive inequality a Duffin and Schaeffer-type inequality for polynomials is shown.     

对连续状态马氏链Dobrushin不等式的一个证明

本文先利用Dobrushin系数的定义和Fubini定理证明一个不等式,相应地给出连续状态马氏链Dobrushin不等式的一个证明.     

Minc H和Sathre L不等式最好的界

给出了函数f(x)和g(x)单调性的证明.据此,得到了著名的Minc H和Sathre L不等式最好的界.     

非局部反应扩散方程的临界爆破指

We prove the existence of the     

关于Landau不等式

本文给出Landau不等式的一种改进。     

Best Meromorphic Approximation of Markov Functions on the Unit Circle

Let E subset(-1,1) be a compact set, let μ be a positive Borel measure with support supp μ =E , and let H _p (G), 1≤ p ≤∈fty, be the Hardy space of analytic functions on the open unit disk G with circumference Γ={z colon |z|=1} . Let Δ _n,p be the error in best approximation of the Markov function frac{1}{2π i} ∈t_E frac{d μ(x)}{z-x} in the space L _p (Γ) by meromorphic functions that can be represented in the form h=P/Q , where P ∈ H _p (G), Q is a polynomial of degree at most n , Qnot equiv 0 . We investigate the rate of decrease of Δ _n,p , 1≤ p ≤∈fty , and its connection with n -widths. The convergence of the best meromorphic approximants and the limiting distribution of poles of the best approximants are described in the case when 1<p≤∈fty and the measure μ with support E=[a,b] satisfies the Szegő condition ∈t_a^b frac{log(d μ/ d x)}{sqrt{(x-a)(b-x)}} dx >- ∈fty. July 27, 2000. Final version received: May 19, 2001.     

关于Shafer-Fink不等式和Carlson不等式

改进了Shafer-Fink不等式的上界,并给出了Carlson不等式的一个上界估计.     

General Bernstein-Like Inequality for Additive Functionals of Markov Chains

Journal of Theoretical Probability - Using the renewal approach, we prove Bernstein-like inequalities for additive functionals of geometrically ergodic Markov chains, thus obtaining counterparts of...     

关于Hadamard不等式等号成立的充要条件

应用定积分的一个性质,对Hadamard不等式等号成立的充要条件进行证明.     

On the Complexity Exponent of Polynomial System Solving

Foundations of Computational Mathematics - We present a probabilistic Las Vegas algorithm for solving sufficiently generic square polynomial systems over finite fields. We achieve a nearly...     

The Markov Brothers Inequality in L 0-Space on an Interval

The exact value of the constant in the Markov brothers inequality in L ₀-space is obtained for algebraic polynomials on an interval.__________Translated from Matematicheskie Zametki, vol. 78, no. 1, 2005, pp. 59–65.Original Russian Text Copyright © 2005 by P. Yu. Glazyrina.     

On the Diophantine Inequality Problem

In this paper,we deal with a Diophantine inequality involving a prime,two squares of primes and one k-th power of a prime which give an improvement of the resul...