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有关凸函数的一个定理的改进证明 总被引:1,自引:1,他引:0
文[1].P5.引理1.1.3的证明过程比较复杂、难以理解,本文用另外一种方法(利用函数的单调性、凹凸性和拉格朗日中值定理)对该定理进行了证明.其证明方法比文[1]的证明方法简单、明了,并对定理的结论进行了推广. 相似文献
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1.引言 为提高用数值方法解非线性发展方程及非线性椭圆边值问题的逼近阶,许多学者例如J.Novo和 E.Titi[4], Marion和 Teman[6],J.Xu[7]以及 W.Layton[9]等人,提出了后验Galerkin方法、近似惯性流形方法、非线性Galerkin方法、各种区域分裂法、多重网格法等等.本文根据[1]提出了一种新的高精度的后验 Galerkin方法.它的逼近阶是经典 Galerkin方法逼近阶的两倍. 考虑非线性椭圆边值问题这里n是按d=2,3)上具有分段光滑边界r的有界区域,… 相似文献
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NGLM:一类全局收敛的Newton-GMRES方法 总被引:6,自引:1,他引:5
本文提出了一类具有全局收敛性质的Newton-GMRES方法—NGLM方法.该方法是对经典Newton—GMRES方法的推广.NGLM方法的全局策略是当在非精确Newton方向上后退不能成功时,转而在一个子空间上运用信赖域方法确定迭代步长.理论分析与数值实验均表明,NGLM方法改善了Newton—GMRES方法的强健性. 相似文献
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关于线性回归模型的有偏估计 总被引:3,自引:0,他引:3
有偏估计方法是近代回归分析的常用方法.本文研究了几种常用的有偏估计方法,澄清了这些方法的区别和联系.对有偏估计的一些关键点进行研究,给出了一种新的岭参数确定法和一种新的主成分概念,并讨论了这些方法的优良性.为了提高有偏估计的效率,提出了用比例因子规范模型的方法.最后,给出了说明本文方法的数值例子. 相似文献
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《数学学报(英文版)》2014,(10)
<正>Submission Authors must use LaTeX for typewriting,and visit our website www.actamath.com to submit your paper.Our address is Editorial Office of Acta Mathematica Sinica,Academy of Mathematics and Systems Science,Chinese Academy of Sciences,Beijing 100190,P.R.China. 相似文献
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《运筹学学报》2014,(3)
正August 10-14,2015Beijin,China The International Congress on Industrial and Applied Mathematics(ICIAM)is the premier international congress in the field of applied mathematics held every four years under the auspices of the International Council for Industrial and Applied Mathematics.From August 10 to 14,2015,mathematicians,scientists 相似文献
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ZhouSongping YaoKui SuWeiyi 《分析论及其应用》2004,20(4):332-341
The present paper investigates the fractal structure of fractional integrals of Weierstrass functions. The ezact box dimension for such functions many important cases is established. We need to point out that, although the result itself achieved in the present paper is interesting, the new technique and method should be emphasized. These novel ideas might be useful to establish the box dimension or Hausdorff dimension (especially for the lower bounds) for more general groups of functions. 相似文献
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《应用数学学报(英文版)》2014,(4)
正1 Aims and Scope Acta Mathematicae Applicatae Sinica(English Series)is a quarterly journal established by the Chinese Mathematical Society.The journal publishes high quality research papers from all branches of applied mathematics,particularly welcomes those from partial differential equations,computational mathematics,applied probability,mathematical finance,statistics,dynamical systems,optimization and management science. 相似文献
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We characterize congruence lattices of standard QBCC-algebras and their connection with the congruence lattices of congruence
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Work on the paper was supported by Council of Czech Government No J14/98:153100011. 相似文献
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A new class of sets in ideal topological spaces is introduced and using these sets, a decomposition of continuity is given.
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We obtain (a) necessary and sufficient conditions and (b) sufficient conditions for a compact (countably compact) set to be closed in products (sequential products) and subspaces (sequential subspaces) of normal spaces. As a consequence of these, sufficient conditions are obtained for (i) the closedness of arbitrary (countable) union of closed sets and (ii) the equality of the union of the closures and the closure of the union of arbitrary (countable) families of sets in these spaces. It is also shown that these results do not hold for quotients of even T
4,-spaces. 相似文献