共查询到18条相似文献,搜索用时 93 毫秒
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通过实例说明反例在理解掌握实变函数概念和证明命题两方面的运用。分析结果显示,反例在澄清模棱两可的概念、纠正错误的认识、深化对概念的理解方面具有一定作用,而且.反例在命题的证明中也占有着它的一席之地与特殊的份量。因此,在学习过程中,应当充分的重视。 相似文献
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实变复值函数的运算遵从普通实函数的运算定律,利用实变复值函数可以简捷方便地求解高阶导数和不定积分. 相似文献
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实变函数课程教学中的反例应用 总被引:1,自引:0,他引:1
通过构造反例,辅助说明一致收敛和几乎处处收敛、依测度收敛和几乎处处收敛、可测函数和连续函数等概念间的关系,以加深学生对相关知识的理解. 相似文献
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本文修补了[1]中苦干定理的漏洞,并且得到了一些有益的新结果,例如定理4等. 相似文献
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Mathematica数学软件的图形功能在微积分中的应用问题 总被引:6,自引:1,他引:5
高东红 《数学的实践与认识》1999,29(4):34-36
讨论如何正确使用Math.的图形功能,对微积分中二元函数在一点极限不存在的情形及二元函数在点不连续但偏导数存在的情形给出几何解释。 相似文献
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基于一维随机变量,通过阐释概率分布实函数实现的内在本质,给出了概率分布实函数实现的一个充分必要条件,得到分布函数族及其连续性特征,揭示出概率论中分布函数定义所蕴含的合理性和深刻性. 相似文献
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Real linear operators arise in a range of applications of mathematical physics. In this paper, basic properties of real linear operators are studied and their spectral theory is developed. Suitable extensions of classical operator theoretic concepts are introduced. Providing a concrete class, real linear multiplication operators are investigated and, motivated by the Beltrami equation, related problems of unitary approximation are addressed. 相似文献
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New applications of generalized condensers with two or more plates are considered. Based on one and the same approach and
simplest properties of such condensers, boundary distortion theorems for analytic univalent functions bounded in a disk are
established, as well as bounds for certain combinations of coefficients in expansions of such functions, inequalities for
polynomials, and theorems on extremal decompositions of the complex sphere. Part of the results obtained contains new information
on the Schwarzian derivative of a regular univalent function. Bibliography: 21 titles.
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Translated from Zapiski Nauchnykh Seminarov POMI, Vol. 314, 2004, pp. 52–75. 相似文献
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The set ${\mathcal A}$ of all non-associative algebra structures on a fixed 2-dimensional real vector space $A$ is naturally a ${\mbox{\rm GL}}(2,{\mbox{\bf R}})$-module. We compute the ring of ${\mbox{\rm SL}}(2,{\mbox{\bf R}})$-invariants in the ring of polynomial functions, ${\mathcal P}$, on ${\mathcal A}$. We use invariant theory to compute the exact number of nonzero idempotents of an arbitrary 2-dimensional real division algebra. We show that the absolute invariants (i.e.,the ${\mbox{\rm GL}}(2, {\mbox{\bf R}})$-invariants in the field of fractions of ${\mathcal P}$) distinguish the isomorphism classes of 2-dimensional non-associative real division algebras. We show that the (open) set $\Omega^+\subset{\mathcal A}$ of all division algebra structures on $A$ has four connected components. A similar result is proved for another class of regular 2-dimensional real algebras (the principal isotopes of the algebra ${\mbox{\bf R}}\oplus{\mbox{\bf R}}$). 相似文献
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本文针对在旋转曲面教学实践中学生较难理解的一些空间旋转曲面问题,利用数学软件Mathematica分析了空间曲线绕任一直线旋转的具体过程,以及求解旋转曲面方程的方法,给出了求旋转曲面的具体步骤,流程图,以及Mathematica代码,并结合具体实例分析旋转过程. 相似文献
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介绍了利用数学软件mathematica 5.0强大功能进行多媒体教学的一个案例,尝试了以实验、探索、发现为特征的启发式教学模式,它符合人类的认知规律,对提高课堂教学质量有一定的效果. 相似文献
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在本文中,我们研究了曲率有下界的开流形的拓扑,并推广了文[7]中的结果,证明了截曲率有下界的开流形如果它的excess函数被它的临界半径的某个函数所界定时,它就具有有限拓扑型或者微分同胚于R^n. 相似文献