二元函数微分中值定理中值点的分析性质

讨论二元函数微分中值定理中值点的连续性及可导性问题,给出二元函数微分中值定理中值点连续及偏导数存在的充分务停,同时给出计算其偏导数的公式。     

论泰勒中值定理“中间点”的性质

研究泰勒中值定理"中间点"的单调性、连续性及可导性.     

积分中值定理的渐进性推广

基于积分中值定理和推广的积分中值定理。通过构造辅助函数．借助罗必达法则。可以得出当区间长度趋于0时推广的积分第一中值定理中值点的渐近性描述．渐近性质的可导性条件可减弱为极限存在性条件，其参数要求也可由非零自然数推广到实数．     

开区间内有不可导点的微分中值定理

给出了开区间内有不可导点的微分中值定理.     

第二积分中值定理中值点的渐近性估计

利用上下极限法研究第二积分中值定理中值点的渐近性态,建立了多个新的渐近性定理,推广和改进了现有文献中的多个相关结果,并给出了现有文献中很少提及的中值点趋向右端点时的渐近性结果.     

几类中值定理中间点的分析性质

给出了广义Taylor公式、高阶Cauchy中值定理及加权型中值定理中间点的单值性、连续性及可导性的充分条件,并给出了求导公式.     

关于积分中值定理

引言设f(t)是区间[a,x]上的连续函数,由积分中值定理,成立■关于中值点ξ当x→a时的渐近性,Jacobson[1]建立了如下有趣的定理设f(t)在a处可导且f'(a)■0,则(1.1)中的ξ当x→a有下式成立■此外,文[2]对推广的积分中值定理的中值点建立了类似于(1.2)的结果,本文的目的是要建立在,f'(a)=0时的某些结果。     

一类函数第一积分中值定理中值点的渐近性

给出了当积分区间的两个端点都为被积函数的若干次零点时,第一积分中值定理中值点的渐近性质.     

与 Cauchy 微分中值定理相关的几个问题

根据Cauchy微分中值定理表达式的结构引入辅助函数 F（x ，c）＝ f （x）- f （c）g（x）- g（c）（a＜ c＜ b），通过讨论其可导性，得到相关的几个不等式，由此得出Cauchy微分中值定理存在唯一“中值点”的一个条件，并给出其逆定理的一个较弱表述。     

积分第一中值定理中值点渐近性

本文从积分第一中值定理出发,在实分析中介绍积分第一中值定理在不同条件下中值点的渐近·I~f＊-I题．     

积分第二中值定理“中间点”的分析性质

主要讨论了积分第二中值定理"中间点"的连续性和可导性.     

Calculating the derivative of piecewise functions

Exercises involving the calculation of the derivative of piecewise defined functions are common in calculus, with the aim of consolidating beginners’ knowledge of applying the definition of the derivative. In such exercises, the piecewise function is commonly made up of two smooth pieces joined together at one point. A strategy which avoids using the definition of the derivative is to find the derivative function of each smooth piece and check whether these functions agree at the chosen point. Showing that this strategy works together with investigating discontinuities of the derivative is usually beyond a calculus course. However, we shall show that elementary arguments can be used to clarify the calculation and behaviour of the derivative for piecewise functions.     

再论微分中值定理“中间点”ξ的性质

主要研究拉格朗日中值定理"中间点"ξ的单调性、连续性及可导性问题.     

Интерполяционные те оремы для классов фун кций с доминирующей смеша нной производной

If a function belongs to two functional spaces with a dominating mixed derivative, then it also belongs to the intermediate spaces (in the sense of the order of differentiation and the integrability exponent). An interpolation theorem is proved for the operators on such spaces. A linear operator is considered which is bounded on each of the two periodic functional spaces with a dominating mixed derivative. Boundedness of the operator on the intermediate functional spces is proved and the corresponding estimates of the norms of the operator are deduced.     

On the concept and existence of solutions for fractional impulsive systems with Hadamard derivatives

In this paper, a class of nonlinear fractional order differential impulsive systems with Hadamard derivative is discussed. First, a reasonable concept on the solutions of fractional impulsive Cauchy problems with Hadamard derivative and the corresponding fractional integral equations are established. Second, two fundamental existence results are presented by using standard fixed point methods. Finally, two examples are given to illustrate our theoretical results.     

Existence Results for Fractional Differential Equations with the Riesz-Caputo Derivative

In this paper, we apply some fixed point theorems to attain the existence of solutions for fractional differential equations with the space-time Riesz-Caputo derivative. We study the boundary value problems that the nonlinearity term $f$ is relevant to fractional integral and fractional derivative. In addition, the boundary conditions involve integral. Two examples are given to show the effectiveness of theoretical results.     

Ultraconvergence of the patch recovery technique

The ultraconvergence property of a derivative recovery technique recently proposed by Zienkiewicz and Zhu is analyzed for two-point boundary value problems. Under certain regularity assumptions on the exact solution, it is shown that the convergence rate of the recovered derivative at an internal nodal point is two orders higher than the optimal global convergence rate when even-order finite element spaces and local uniform meshes are used.

     

A physical interpretation for the fractional derivative in Levy diffusion

To the authors' knowledge, previous derivations of the fractional diffusion equation are based on stochastic principles [1], with the result that physical interpretation of the resulting fractional derivatives has been elusive [2]. Herein, we develop a fractional flux law relating solute flux at a given point to what might be called the complete (two-sided) fractional derivative of the concentration distribution at the same point. The fractional derivative itself is then identified as a typical superposition integral over the spatial domain of the Levy diffusion process. While this interpretation does not obviously generalize to all applications, it does point toward the search for superposition principles when attempting to give physical meaning to fractional derivatives.