On essential ϕ-variation

We study relations between the classical essential variation and approximate continuity. In particular, we show that the classical essential variation of functions on the so-called τ _D-regular sets agrees with essential variation in the sense of W. P. Ziemer.     

Hoeder Continuity of Weak Solutions for Parabolic Equations with Nonstandard Growth Conditions

In this paper, we investigate the interior regularity including the local boundedness and the interior HSlder continuity of weak solutions for parabolic equations of the p（x, t）-Laplacian type. We improve the Moser iteration technique and generalize the known results for the elliptic problem to the corresponding parabolic problem.     

局部凸代数L(E)的乘法连续性

本文讨论了(E,σ(E,E′))上连续自同态代数L(E)上在几种常见拓扑下的乘法连续性,得到相应的等价条件．     

高维空间中的微分中值定理

把高等数学课程中一元函数的微分中值定理推广到多元函数及向量值函数上去，提供了某些一维定理如何推广到高维空间的例子。     

Every Cech-analytic Baire semitopological group is a topological group

Among other things, we prove the assertion given in the title. This solves a problem of Pfister.

     

超解析函数在可求长Jordan闭曲线的Riemann边值问题

本文研究超解析函数在非光滑可求长 Jordan 闭曲线上具有非 Hlder系数的 Riemann 边值问题,利用文中构造的超复积分算子,求得了问题的一般解及可解的充分必要条件。     

Jackson积分算子对连续函数的逼近

设K.是Jackson算子J_n的逼近度。本文应用[2]中K_2的积分表示,证明{K_(2N-1)}渐减到K=3/πintegral from n=0 to ∞[4/πt](sint/t)~4dt并且对所有的u,有K_s≥K_2=2(1-2/π3~(1/2),以及inf sup||J_n(f)-f||_e/ω(f,π/n+1)=K_2=2(1-2/π3~(1/2))     

关于Fejer算子最佳逼近的极限常数问题

本文给出Fejer算子在和时最佳逼近的极限常数。     

Holomorphic Jackson's theorems in polydiscs

The purpose of this article is to establish Jackson-type inequality in the polydiscs U^N of for holomorphic spaces X, such as Bergman-type spaces, Hardy spaces, polydisc algebra and Lipschitz spaces. Namely,

where is the deviation of the best approximation of fX by polynomials of degree at most k_j about the jth variable z_j with respect to the X-metric and is the corresponding modulus of continuity.     

Normalized Solutions of Schrödinger Equations with Potentially Bounded Measures

Given a potentially bounded signed measure on a Brelot space (X,) with Green function G, it is well known that -harmonic functions (i.e., in the classical case, finely continuous versions of solutions to u–u=0) may be very discontinuous. In this paper it is shown that under very general assumptions on G (satisfied for large classes of elliptic second-order linear differential operators) normalized perturbation, however, leads to a Brelot space (X, ) admitting a Green function T (G) which is locally (or even globally) comparable with G and has all properties required of G before. In particular, iterated perturbation is possible. Moreover, intrinsic Hölder continuity of quotients of harmonic functions with respect to the local quasimetric :=(G ^–1+^* G ^–1)/2 yields -Hölder continuity for quotients of -harmonic functions as well.