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In this paper we define two classes of quasiconformal mappings,and study their covering properties by methods of module.We obtain some new results.In the meantime,we give new methods to prove Koebe 1/2 covering theorem on convex conformal mappings. 相似文献
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This paper investigates the dynamics of a TCP system described by a first- order nonlinear delay differential equation. By analyzing the associated characteristic transcendental equation, it is shown that a Hopf bifurcation sequence occurs at the pos- itive equilibrium as the delay passes through a sequence of critical values. The explicit algorithms for determining the Hopf bifurcation direction and the stability of the bifur- cating periodic solutions are derived with the normal form theory and the center manifold theory. The global existence of periodic solutions is also established with the method of Wu (Wu, J. H. Symmetric functional differential equations and neural networks with memory. Transactions of the American Mathematical Society 350(12), 4799-4838 (1998)). 相似文献
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引入区域的最大最小不等式性质,研究最大最小不等式性质和一致域的关系,得到了下述结果: (1)区域的最大最小不等式性质具有拟共形不变性; (2)如果区域D是一致域,则D具有最大最小不等式性质; (3)若D和它的外部D=R2\D具有最大-最小不等式性质,则D是R2中的一致域. 相似文献
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利用区域的最大-最小不等式性质的拟共形不变性和圆的最大-最小不等式性质,得到了拟圆的最大-最小不等式性质. 相似文献
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讨论了标准Cantor集 F 的Hausdorff维数dimH(F)在拟共形映射 f 下的变化, 给出了dimH(f(F))的准确上下界. 相似文献
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运用频域法研究了一类具有时滞的单模激光系统,选择时滞τ作为参数,当τ通过某个临界值时,Hopf分支产生,即从平衡点处分支出一簇周期解,最后,利用数值模拟证实理论分析结果的正确性. 相似文献
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