共查询到19条相似文献,搜索用时 218 毫秒
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利用推广到二元实函数上的微分中值定理,将实数域上的微分中值定理推广到复数域上,可得到利用导数研究解析函数性质的工具,即关于解析函数的微分中值定理. 相似文献
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根据微分中值定理和积分中值定理定义微分点与积分点.证明严格单调函数与凸(凹)函数中微分点与积分点间的一些关系式,指出在函数对称的情况下微分点与积分点之间也存在着对称关系,并给出一类向量函数以及多项式函数中微分点与积分点间的关系式. 相似文献
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泰勒中值定理中值点的分析性质 总被引:1,自引:0,他引:1
程希旺 《数学的实践与认识》2009,39(4)
讨论泰勒中值定理中中值点的连续性及可导性问题,给出泰勒中值定理中中值点连续及可导的充分条件,同时给出计算其导数的公式. 相似文献
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基于微分中值定理证明微积分基本公式和积分中值定理 总被引:4,自引:0,他引:4
我们都知道证明微积分基本公式 (牛顿—莱布尼兹公式 )和证明积分中值定理的通常的方法 ,也就是先利用积分中值定理推出积分上限的函数的导数公式 ,然后由此再借助原函数的概念证明微积分基本公式 ,以及利用定积分的性质 (即估值定理 )和闭区间上连续函数的介值定理证明积分中值定理 ,其中积分中值定理的中间点 ξ的范围是 a≤ ξ≤ b[1] .本文将根据微分中值定理和定积分定义直接证明微积分基本公式 ,并直接揭示微分学和积分学的密切联系 ;进一步 ,根据微分中值定理和原函数存在定理简洁地证明积分中值定理 ,并阐明它的中间点 ξ的范围是 a… 相似文献
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B Tomas Johansson 《International Journal of Mathematical Education in Science & Technology》2016,47(1):144-148
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. 相似文献
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Н. С. Бахвалов 《Analysis Mathematica》1989,15(1):55-65
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. 相似文献
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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. 相似文献
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Ultraconvergence of the patch recovery technique 总被引:14,自引:0,他引:14
Zhimin Zhang. 《Mathematics of Computation》1996,65(216):1431-1437
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.
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Sufficient conditions for the proper and unique solvability in the Sobolev space of vector functions of the boundary value problem for a certain class of second-order elliptic operator differential equations on a semiaxis are obtained. The boundary condition at zero involves an abstract linear operator. The solvability conditions are established by using properties of operator coefficients. The norms of intermediate derivative operators, which are closely related to the solvability conditions, are estimated. 相似文献
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Michal Fec?kan JinRong Wang 《Communications in Nonlinear Science & Numerical Simulation》2012,17(7):3050-3060
This paper is motivated from some recent papers treating the problem of the existence of a solution for impulsive differential equations with fractional derivative. We firstly show that the formula of solutions in cited papers are incorrect. Secondly, we reconsider a class of impulsive fractional differential equations and introduce a correct formula of solutions for a impulsive Cauchy problem with Caputo fractional derivative. Further, some sufficient conditions for existence of the solutions are established by applying fixed point methods. Some examples are given to illustrate the results. 相似文献