排序方式: 共有35条查询结果,搜索用时 15 毫秒
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Yoshihiro Hamaya 《Journal of Difference Equations and Applications》2013,19(9):805-817
We introduce the concept of the second Liapunov differences in difference equations and show that, in the autonomous case, the second variations can guarantee the existence of solutions tending to zero while others starting arbitrarily near 0 go to ∞. These are based on Yorke's results for ordinary differential equations. 相似文献
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《佛山科学技术学院》2014,6(1):41-57
In this paper, we extend the concept of invertibility to -topological spaces and delineate its properties. Then, we study further completely invertible -topological spaces and introduce two types of invertible -topologies based on the inverting maps, studying their sums, subspaces and simple extensions. 相似文献
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In this paper, using the integral method observed by Mai Jiehua recently, we show that no dendrite admits a sensitive commutative group action. 相似文献
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In this paper, sufficient conditions are obtained for the existence of a unique periodic solution for a class of differential systems. 相似文献
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子流形与拓扑球面定理 总被引:1,自引:0,他引:1
本文建立了球面Sn p(c) (c>0 )中的完备子流形的一个拓扑球面定理 ,结果表明完备子流形的拓扑是受其内在和外在曲率不变量满足的某些条件所影响的 相似文献
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Given a class
of mappings f between continua, near-
stands for the class of uniform limits of sequences of mappings from
. Let 2f and C(f) mean the induced mappings between hyperspaces. Relations are studied between the conditions: f near-
, 2f near-
and C(f) near-
. A special attention is paid to the classes
of open and of monotone mappings. 相似文献
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A n-vertex graph is said to be decomposable if, for any partition (λ1,…,λp) of the integer n, there exists a sequence (V1,…,Vp) of connected vertex-disjoint subgraphs with |Vi|=λi. The aim of the paper is to study the homeomorphism classes of decomposable trees. More precisely, we show that homeomorphism classes containing decomposable trees with an arbitrarily large minimal distance between all pairs of distinct vertices of degree different from 2, is exactly the set of combs. 相似文献