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arXiv 0911.2126math.DS
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分形吸引子的拓扑分离条件

A Topological Separation Condition for Fractal Attractors

T. Bedford, S. Borodachov, J. Geronimo

摘要:

考虑完全度量空间的有限压缩同胚系统,它们在每一层上都是非冗余的。一般来说,这个分离性条件比强开集条件弱,并且不等价于弱分离性。我们证明了这个分离条件等价于强马尔可夫性(见下面的定义)。我们还证明了压缩同胚的$N$ -元组的集合,这是非冗余的每一个水平,是一个$G_δ$集的点式收敛拓扑拓扑的每一个组件映射的压缩系数的上确界严格小于1的附加要求。我们给出了这种分离性的几个充分条件。对于某类$d\times d$可逆压缩矩阵的固定$N$ -元组,我们得到了不动点的$N$ -元组的密度结果,这些不动点定义了每层上非冗余映射的$N$ -元组.

英文摘要:

We consider finite systems of contractive homeomorphisms of a complete metric space, which are non-redundant on every level. In general this separation condition is weaker than the strong open set condition and is not equivalent to the weak separation property. We prove that this separation condition is equivalent to the strong Markov property (see definition below). We also show that the set of $N$-tuples of contractive homeomorphisms, which are non-redundant on every level, is a $G_δ$ set in the topology of pointwise convergence of every component mapping with an additional requirement that the supremum of contraction coefficients of mappings be strictly less than one. We give several sufficient conditions for this separation property. For every fixed $N$-tuple of $d\times d$ invertible contraction matrices from a certain class, we obtain density results for $N$-tuples of fixed points which define $N$-tuples of mappings non-redundant on every level.

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