共查询到20条相似文献,搜索用时 15 毫秒
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Jinge Yang Sining Zheng Chengyuan Qu 《Zeitschrift für Angewandte Mathematik und Physik (ZAMP)》2013,64(2):311-319
This paper deals with the Fujita phenomenon for the Cauchy problem of an inhomogeneous fast diffusion system. Both the critical exponent and the second exponent are obtained. We observe that the inhomogeneous terms in the system substantially contribute to the critical exponent, in that the blow-up exponent region is obviously enlarged, with keeping the second critical exponent unchanged for small inhomogeneous sources. 相似文献
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Lyapunov指数l是定量描述混沌吸引子的重要指标,自从1985年Wolf提出Lyapunov指数l的轨线算法以来,如何准确、快速地计算正的、最大的Lyapunov指数lmax便成为人们关注的问题,虽有不少成功计算的报导,但一般并不公开交流.在Zuo Bingwu理论算法的基础上,给出了Lyapunov指数l的具体的矩阵算法,并与Wolf的算法进行了比较,计算结果表明:算法能快速、准确地计算(主要是正的、最大的)Lyapunov指数lmax.并对Lyapunov指数l的大小所反应的吸引子的特性进行了分析,并得出了相应的结论. 相似文献
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《Applied Mathematics Letters》2007,20(2):142-147
This work is concerned with the critical exponent of the non-Newtonian polytropic filtration equation with nonlinear boundary conditions. We obtain the critical global existence exponent and critical Fujita exponent by constructing various self-similar supersolutions and subsolutions. 相似文献
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一个有向图D称为本原的,如果存在某个正整数k,使得对于D中的任一点x到任一点y都有长为k的途径,这样的正整数k中的最小者称为D的本原指数,作为本原指数概念的推广,R.A.Brualdi和柳柏濂于1990年引入了本原有向图的广义本原指数的新概念,本文给出了对称本原图的集指数的一些性质,并对本原简单图的广义上指数的极图进行了完全刻划。 相似文献
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Mitsuo Izuki 《Rendiconti del Circolo Matematico di Palermo》2010,59(3):461-472
Our first aim in this paper is to prove boundedness of commutators with fractional integrals on Lebesgue spaces with variable exponent. We additionally obtain the boundedness on Herz spaces with variable exponent applying some properties of variable exponent and BMO norms. 相似文献
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Przemysław Górka 《Periodica Mathematica Hungarica》2016,72(2):243-247
We prove an Ergodic Theorem in variable exponent Lebesgue spaces, whenever the exponent is invariant under the transformation. Moreover, a counterexample is provided which shows that the norm convergence fails to hold for an arbitrary exponent. 相似文献
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Primo? Moravec 《Journal of Pure and Applied Algebra》2008,212(7):1840-1848
We prove that the exponent of the nonabelian tensor product of two locally finite groups can be bounded in terms of exponents of given groups. Several estimates for the exponents of nonabelian tensor squares are obtained. In particular, if the group G is nilpotent of class ≤3 and of finite exponent, then the exponent of its nonabelian tensor square divides the exponent of G. 相似文献
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A monotonicity formula for stable solutions to a class of weighted semilinear elliptic equations with "negative exponent" is established.It is well known that such a monotonicity formula plays an essential role in the study of finite Morse index solutions of equations with "positive exponent".Unlike the positive exponent case,we will see that both the monotonicity formula and the sub-harmonicity play crucial roles in classifying positive finite Morse index solutions to the equations with negative exponent and obtaining sharp results for their asymptotic behaviors. 相似文献
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求一个特殊矩阵的n次幂的方法 总被引:2,自引:2,他引:0
由两个特殊的低阶方阵的n次幂,猜测出一种特殊形式的k阶方阵A的n次幂,然后通过数学归纳法证明了结果的正确性.本文提供了一种求特殊幂的方法.对求矩阵的幂给出了一种新思路. 相似文献
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Kangqiao Li 《代数通讯》2013,41(11):4476-4495
In 1999, Kashina introduced the exponent of a Hopf algebra. In this article, we prove that the exponent of a finite-dimensional non-cosemisimple Hopf algebra with Chevalley property in characteristic 0 is infinite, and the exponent of a finite-dimensional non-cosemisimple pointed Hopf algebra in positive characteristic is finite. 相似文献
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本文研究一类本原有向图的广义重下指数集 ,证明了 n(≥ 3)阶围长为 2的本原有向图的广义 k(≥ 2 )重下指数的最大值为 n-k,并给出其指数集的完全刻划 . 相似文献
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In this article, by extending classical Dellacherie's theorem on stochastic sequences to variable exponent spaces, we prove that the famous Burkholder-Gundy-Davis inequality holds for martingales in variable exponent Hardy spaces. We also obtain the variable exponent analogues of several martingale inequalities in classical theory, including convexity lemma, Chevalier's inequality and the equivalence of two kinds of martingale spaces with predictable control. Moreover, under the regular condition on σ-algebra sequence we prove the equivalence between five kinds of variable exponent martingale Hardy spaces. 相似文献
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本文给出了循环矩阵本原指数上界的新的估计及一种由级数较低的循环矩阵的本原指数估计级数较高的循环矩阵的本原指数的方法,解决了一类循环矩阵本原指数的计算问题. 相似文献
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Jean-Michel RAKOTOSON 《数学年刊B辑(英文版)》2010,31(6):991-1006
The author first studies the Lipschitz properties of the monotone and relative rearrangement mappings in variable exponent Lebesgue spaces completing the result given in [9]. This paper is ended by establishing the Lipschitz properties for quasilinear problems with variable exponent when the right-hand side is in some dual spaces of a suitable Sobolev space associated to variable exponent. 相似文献
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在变指数Lebesgue空间Lp(x)(Ω)、变指数Sobolev空间W~1,p(x)(Ω)、加权变指数Lebesgue空间Lp(x)(Ω;|x~(α(x)))和加权变指数Sobolev空间W~1,p(x)(Ω;|x|~(a(x)))的基本理论体系的基础上利用山路引理得到一类p(x)-Laplace方程非平凡解的存在性. 相似文献
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<正> §1.引言 1952年(?)提出线性组特征指数稳定性定义和一些重要的结果,同一年(?)对一类非线组的特征指数分布作了较详细的研究.1955年(?)给出了一类非线性组之正则首次近似(对角型)的最大特征指数上稳定性的充要条件.本文将研究较广泛非线性组之首次近似最大特征指数的上稳定性、最小特征指数的下稳定性及解的渐近稳定性. 相似文献