排序方式: 共有49条查询结果,搜索用时 15 毫秒
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研究外区域上的抛物型Monge-Ampere方程-u_t det(D~2u)=f解的存在性.利用Perron方法得到了该方程的外问题具有渐近性质解的存在性与唯一性. 相似文献
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In this paper we first present a 3-dimensional Lie algebra H and enlarge it into a 6-dimensional Lie algebra T with corresponding loop algebras?H and?T, respectively. By using the loop algebra?H and the Tu scheme, we obtain an integrable hierarchy from which we derive a new Darboux transformation to produce a set of exact periodic solutions. With the loop algebra?T, a new integrable-coupling hierarchy is obtained and reduced to some variable-coefficient nonlinear equations, whose Hamiltonian structure is derived by using the variational identity. Furthermore, we construct a higher-dimensional loop algebraˉH of the Lie algebra H from which a new Liouville-integrable hierarchy with 5-potential functions is produced and reduced to a complex m Kd V equation, whose 3-Hamiltonian structure can be obtained by using the trace identity. A new approach is then given for deriving multiHamiltonian structures of integrable hierarchies. Finally, we extend the loop algebra?H to obtain an integrable hierarchy with variable coefficients. 相似文献
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周仲旺 《高校应用数学学报(A辑)》2020,(1):115-120
给出了图P2×Cn的全符号{k}-控制数,该结果纠正了Bohdan Zelinka(2001)的一个错误. 相似文献
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《数学的实践与认识》2016,(23)
广义Cauchy张量是由Cauchy张量推广而来,将在Cauchy张量的基础上,围绕广义Cauchy张量的正定性及共正性展开研究,并提出关于广义Cauchy张量互补问题的几个结论. 相似文献
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Sheikholeslami把求完全二部图图的全符号{k}-控制数和全符号{k}-色数作为待研究的一个问题,本文用构造的方法彻底解决了这个问题. 相似文献
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应急资源调度模型及算法 总被引:2,自引:0,他引:2
应急问题最显著的特点表现为时间的紧迫性.本文针对应急系统多点出救的特点,研究了消耗速率为函数的连续型应急资源调度模型.该模型以最早应急时间为目标,给出了最早应急时间的求取方法,数值算例表明了算法的有效性和实用性. 相似文献
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一类多项式型迭代函数方程在共振点附近的解析解 总被引:1,自引:0,他引:1
In this paper existence of local analytic solutions of a polynomial-like iterative functional equation is studied. As well as in previous work, we reduce this problem with the SchrSder transformation to finding analytic solutions of a functional equation without iteration of the unknown function f. For technical reasons, in previous work the constant α given in the Schroder transformation, i.e., the eigenvalue of the linearized f at its fixed point O, is required to fulfill that α is off the unit circle S^1 or lies on the circle with the Diophantine condition. In this paper, we obtain results of analytic solutions in the case of α at resonance, i.e., at a root of the unity and the case of α near resonance under the Brjuno condition. 相似文献
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细致分析和研究积分不等式、积分值序列的极限、含参变量积分的极限等若干方面诸多问题的解决过程,提炼出其中蕴含的一类解题方法--分段估值法. 相似文献
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程雪梅 《数学的实践与认识》2014,(7)
一类带有三次项的平面五次微分系统在Poincare变换下可以讨论系统的无穷远奇点的性质,进而得到奇点附近轨线的拓扑结构,并利用判断函数给出极限环存在与否的条件,补充完善了五次系统的定性分析. 相似文献