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关于隶属函数和属性测度的注记 总被引:1,自引:0,他引:1
胡志斌 《数学的实践与认识》1999,29(4):93-96
讨论了隶属函数和属性测度的数学涵义,并讨论了它们的一个基本关系式。 相似文献
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本文讨论了A.A.Logunov相对引力论中的场方程,给出了一种形式的近似解,并且讨论了几种情形的解的非存在性。特别地,讨论了R(2+1)中的情形. 相似文献
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讨论了Gpp环和Gp-内射模的一些性质;讨论了Gp-内射模和R-内射模的关系及Gp-内射模和Gpp环的若干联系.最后讨论了和Gpp环有关的有限生成模的投射盖问题. 相似文献
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讨论了Clifford分析中双曲调和函数的一个带位移的非线性边值问题,先讨论了解析函数的一个边值问题的解的存在性,然后利用Clifford分析中双曲调和函数与解析函数的关系讨论了此边值问题的解,并给出了解的积分表达式. 相似文献
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本文讨论半马氏环境连续时间马氏决策过程中的平均准则.首先讨论了半马氏报酬过程中的逼近问题,进而讨论平均目标函数逼近问题。 相似文献
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一类具滞后影响的捕食与被捕食者模型的探讨 总被引:1,自引:0,他引:1
1973年 May 讨论过模型(?)他主要从生态的角度进行了讨论.数学上的讨论集中在分析特征方程及平衡点的稳定性,并未严格证明非常数周期解的存在性.1957年 Wangersky 和 Cunuinghan 曾讨论过下面的模型:(?)他们的讨论比之前者更偏重于生态的讨论,很少涉及数学上的深入讨论.本文讨论下面的模型: 相似文献
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一类三阶非线性微分方程解的不稳定性* 总被引:2,自引:0,他引:2
文献[1]讨论了非线性缓变系统的渐近稳定性,文献[2]讨论了三阶变系数线性微分方程解的不稳定性。本文应用文献[1]、[2]的方法讨论一类三阶非线性微分方程解的不稳定性。 相似文献
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Iatroduct 相似文献
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一类脉冲微分方程零解的稳定性 总被引:2,自引:0,他引:2
本文研究了一类在非固定时刻的脉冲微分方程。利用Lyapunov第二方法,建立了零解为稳定,渐近稳定及不稳定的判别准则。结果表明脉冲可能影响甚至改变相应的无脉冲时的微分方程的稳定性。文中还给出一例说明所得主要结果的应用。 相似文献
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Derivatives of eigenvalues and eigenvectors with respect to parameters in symmetric quadratic eigenvalue problem are studied. The first and second order derivatives of eigenpairs are given. The derivatives are calculated in terms of the eigenvalues and eigenvectors of the quadratic eigenvalue problem, and the use of state space representation is avoided, hence the cost of computation is greatly reduced. The efficiency of the presented method is demonstrated by considering a spring-mass-damper system. 相似文献
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The functional dimension of countable Hilbert spaces has been discussed by some authors. They showed that every countable Hilbert space with finite functional dimension is nuclear. In this paper the authors do further research on the functional dimension, and obtain the following results: (1) They construct a countable Hilbert space, which is nuclear, but its functional dimension is infinite. (2) The functional dimension of a Banach space is finite if and only if this space is finite dimensional. (3) Let B be a Banach space, B* be its dual, and denote the weak * topology of B* by σ(B*,B). Then the functional dimension of (B*,σ(B*,B)) is 1. By the third result, a class of topological linear spaces with finite functional dimension is presented. 相似文献
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1.:敲g(x)篇〔一二,二]上之非降的有界缝差两数,业具有性鬓(K)s‘二一0,一。(:);f--:.,。g。尹(:)!d:一郁匕,(‘一”,”;dg)篇在〔一二,司上定羲业且满足修件:,一{户,(柳dg(·)}青<一,>l的可测蝮值函数族{f(幻}.封龄一徊乙“(一二,侧d刃中之子族凌B(幻},若由f(劣)(乙,(一二,二:dg),夕>1生+上夕q=1,及f--:ha”“’“““’一0纷{B(x)}之任何B(哟成立必滇致f(幻在〔一二,司上规乎虚虚等焚零则释{B(x)}在乙“(一二,侧dg)中完全. 函数族的完全性是舆函数横造的一些简题很有阴保的.徙【l]我们知道{e‘”}豁。是在乙,(一二,州dg),,>1,中完全的,… 相似文献
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Luo Chenghui 《数学年刊B辑(英文版)》1992,13(2):244-250
Suppose Q(ζ_m) is the m-th cyclotomic number field, where ζ_m is an m-th primitive root of unity, m>1 any integer. Let a_m=ζ_m+ζ_m~2+...+ζ_m~((m-1)/2) if m is odd and let β_m be the product of the integersl-ζ_m(1相似文献
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GEORGY P. KAREV 《Natural Resource Modeling》2001,14(1):31-43
ABSTRACT. The problem of mathematical modeling of the phenomenon of appearance and forming of allocated tree subpopulations, called gap, locus, cenon is studied. Such a subpopulation (not a single tree) is considered as an individual object of the forest community. A mathematical model describing the phenomenon of cenon formation as a result of natural dynamics of initial heterogeneous tree subpopulation is suggested. The model is constructed in the framework of a structural population model of one generation with distributed values of parameters and initial states. The “biological basis” of cenon formation is the so-called discriminating death. It is shown that this component of death accounted for the model results in the formation of the comparatively homogeneous subpopulation from the initial heterogeneous sub-population of trees. 相似文献
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《Quaestiones Mathematicae》2013,36(1-2):1-5
Abstract A family K of right R-modules is called a natural class if K is closed under submodules, direct sums, infective hulls, and isomorphic copies. The main result of this note is the following: Let K be a natural class on Mod-R and M ε K. If M satisfies a.c.c. (or d.c.c.) on the set of submodules {N ? M: M/N ε K}, then each nil subring of End(MR ) is nilpotent. 相似文献