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介绍数学分析课程中处处连续但处处不可导函数的教学,通过电子课件演示函数的图象,使学生理解这一类函数的局部与整体的某种相似性质,并对“分形”概念有一个初步的了解. 相似文献
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R.J.O'Mallcy曾做了不少工作[1][2],但是在“贝尔*1、达布函数的插值”一文[1]所得到的结果却是不真的.文[1]定理2指出:“设f,g是贝尔l、达布函数,如果对于任意的x0,ε>0.δ>0,集{x||f(x)-f(x0)│<ε,|g(x)-g(x0)<ε|∩U(f,g)∩(x0+x0+δ)≠?,且对x0的左半邻域相应陈述同样成立,其中U( 相似文献
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Bush连续不可微函数的分形性质 总被引:1,自引:0,他引:1
本文对用递推关系确定的Bush连续不可微函数,找出了迭代函数系(IFS),从而得到它的级数表达式和所具有的自仿射分形的有关性质.最后还计算出函数图象的Hausdorff 维数的准确值. 相似文献
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本文考虑第二类Feigenbaum函数方程,探讨了该方程的连续解的性态及由某平顶单谷映射扩充所能得到的一切连续解的性态,并给出了构造由某平顶单谷映射扩充所能得到的一切连续解的可行方法。 相似文献
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通过分析一个具体的函数实例,发现Darboux连续函数在不连续点附近具有无限震荡的特性,并给出严格证明,从而得到Darboux连续函数在不连续点处独有的局部性态. 相似文献
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Aleksander Maliszewski 《Transactions of the American Mathematical Society》1998,350(7):2833-2846
Let be the family of functions which can be written as the average of two comparable Darboux functions. In 1974 A. M. Bruckner, J. G. Ceder, and T. L. Pearson characterized the family and showed that if , then is the family of the averages of comparable Darboux functions in Baire class . They also asked whether the latter result holds true also for . The main goal of this paper is to answer this question in the negative and to characterize the family of the averages of comparable Darboux Baire one functions.
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东瑜昕 《中国科学A辑(英文版)》2002,45(12)
We present a unified method for constructing generalized flag transformations of unitons intoa Lie group G via singular Darboux transformations. These flag transformations provide the possibility toestablish some factorizations for G-unitons. 相似文献
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Dong Yuxin 《中国科学A辑(英文版)》2002,45(12):1497-1505
We present a unified method for constructing generalized flag transformations of unitons into a Lie groupG via singular Darboux transformations. These flag transformations provide the possibility to establish some factorizations
forG-unitons. 相似文献
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For an uncountable monounary algebra (A, f) with cardinality κ it is proved that (A, f) has exactly 2κ retracts. The case when (A, f) is countable is also dealt with.
This work was suported by the the Slovak VEGA Grant No. 1/3003/06. This work was supported by Science and Technology Assistance
Agency under the contract No. APVT-20-004104. 相似文献
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Krzysztof Ciesielski Janusz Pawlikowski 《Proceedings of the American Mathematical Society》2002,130(7):2007-2013
We show that the property
- (P)
- for every Darboux function there exists a continuous nowhere constant function such that is Darboux
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- for every subset of of cardinality there exists a uniformly continuous function such that ,
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- for an arbitrary function whose image contains a non-trivial interval there exists an of cardinality such that the restriction of to is uniformly continuous,
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The notion of Darboux helix in Euclidean 3‐space was introduced and studied by Yayl? et al. 2012. They show that the class of Darboux helices coincide with the class of slant helices. In a special case, if the curvature functions satisfy the equality κ2 + τ2 = constant, then these curves are curve of the constant precession. In this paper, we study Darboux helices in Euclidean 4‐space, and we give a characterization for a curve to be a Darboux helix. We also prove that Darboux helices coincide with the general helices. In a special case, if the first and third curvatures of the curve are equal, then Darboux helix, general helix, and V4‐slant helix are the same concepts. 相似文献
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任意基数集上的拟阵之单扩张 总被引:2,自引:1,他引:1
对于由Betten和Wenzel于2003年提出的任意基数集上的拟阵其相应的秩公理给予了证明,并将此结果用于研究任意基数集上的拟阵的单扩张问题. 相似文献