实变函数中的集合论方法应用

本文通过举例探讨集合表示法和集合分析法在实变函数相关内容教学中的具体应用.     

实变复值函数在微积分中的应用

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.     

Mathematica在实变函数教学中的应用

简要介绍了Mathematica 8及CDF Player的基本功能.通过多个实例,详细展示了CDF Player在实变函数教学中的应用.     

论实变函数解题方法

根据多年的教学经验较系统地总结了实变函数的解题方法,这些方法很值得师生学习和应用.     

实变函数反例研究(Ⅱ)

列举了实变函数中的多个反例.这些反例说明,在条件改变之后一些重要结论不再成立.这可增强人们对实变函数内容的深刻认识.文中的测度与积分都不是Lebesgue测度与积分.     

北京数学界学术活动通讯

1.北京大学数学力学学系开了很多专门化课程,茲将其专门化课程名称列后: 1957—1958第一学期 1956—1957第二学期实变函数专门化概率论专门化代数专门化复变函数专门化偏微分方程专门化实变函数专门化数理逻辑专门化代数专门化     

Bergman空间的实变刻画

介绍复球上Bergman空间实变理论的某些新进展,包括Bergman空间关于Carleson矩形的实变原子分解,极大函数和面积函数刻画以及运用帐篷空间的实变刻画.特别是,用齐次空间上向量值Calderón-Zygmund奇异积分算子理论研究Bergman积分算子的Lp有界性并给出了Bergman空间面积积分刻画的新证明...     

相关于微分算子的(Musielak-)Orlicz-Hardy空间的实变理论及其应用

众所周知,Calderón-Zygmund奇异积分算子理论及刻画这些算子有界性的各种函数空间的实变理论因其在调和分析和偏微分方程等数学分支中有重要的应用而成为现代调和分析的主要内容之一.然而,经典函数空间的实变理论已不再适用于刻画相关于某些比Laplace算子更一般的微分算子的奇异积分算子的有界性.因此,对不同的算子发展与其相适应的、能刻画其相关奇异积分算子有界性的函数空间的实变理论已成为调和分析中近年来十分活跃的研究方向之一.本文主要研究n维欧氏空间Rn、Rn中的强Lipschitz区域或更一般的带双倍测度的度量空间上与包括二阶散度型椭圆算子和Schr?dinger算子在内的微分算子相关的(Musielak-)Orlicz-Hardy空间的实变理论及其在算子有界性中的应用.     

Riemann—Lebesgue定理及其应用

本文利用实变函数方法详细证明了Riemann-Lebesgue定理在开集上成立,并且给出了其应用.     

复数域中的微积分基本定理

根据复变函数与实变函数在许多概念、理论和方法上的相似之处,将实数域上的微积分基本定理适当推广至复数域.此外,给出一个复平面区域上的每一个解析函数都有原函数的等价条件.     

Study of the blow-up of solutions of systems of equations of hydrodynamic type

Mathematical Notes - We study the initial boundary-value problem for three-dimensional systems of equations of pseudoparabolic type. The system is similar to the Oskolkov system, but differs from...     

Characterization of types of asymptotic discernibility of families of hypotheses

We give a characterization of the types of asymptotic discernibility of families of hypotheses in the case of hypothetical measures that are not, in general, mutually absolutely continuous. The case when the logarithm of the likelihood ratio admits an asymptotic expansion of the type of an expansion with local asymptotic normality is examined in detail. Examples are studied.Translated fromTeoriya Sluchainykh Protsessov, Vol. 15, pp. 64–71, 1987.     

Distribution of types of symmetry of tensors of high degree

The asymptotic distribution of tensors of degree N in symmetry types is studied in this paper.Translated from Zapiski Nauchnykh Seminarov Leningradskogo Otdeleniya Matematicheskogo Instituta im. V. A. Steklova AN SSSR, Vol. 155, pp. 181–186, 1986.     

Axiomatizability of reducts of algebras of relations

In this paper, we prove that any subreduct of the class of representable relation algebras whose similarity type includes intersection, relation composition and converse is a non-finitely axiomatizable quasivariety and that its equational theory is not finitely based. We show the same result for subreducts of the class of representable cylindric algebras of dimension at least three whose similarity types include intersection and cylindrifications. A similar result is proved for subreducts of the class of representable sequential algebras. Received October 7, 1998; accepted in final form September 10, 1999.     

Lengths of periods of continued fractions of square roots of integers

Empirical study of the period’s length T of the continued fractions of $\sqrt{Q}$ (for growing integers Q) shows several strange asymptotical results, for instance, $T\leq C\sqrt{Q}\ln{Q}$ . These results show important differences between the statistics of the elements of the continued fractions of random real numbers and of square roots of random integers.