本文主要研究拓扑空间中同伦的相关性质,进而讨论道路的逆及乘法运算,由此得到基本群,通过证明知基本群为拓扑不变量,最后利用基本群证明二维球面S2不同胚于环面T2。This article mainly studies the relevant properties of homotopy i...本文主要研究拓扑空间中同伦的相关性质,进而讨论道路的逆及乘法运算,由此得到基本群,通过证明知基本群为拓扑不变量,最后利用基本群证明二维球面S2不同胚于环面T2。This article mainly studies the relevant properties of homotopy in topological spaces, and then discusses the inverse and multiplication operations of roads, thereby obtaining the fundamental group. By proving that the known fundamental group is a topological invariant, the fundamental group is finally used to prove that the two-dimensional sphere S2 is different from the torus T2.展开更多
本文研究Zorich映射逆分支生成的紧集族上概率测度序列的弱收敛性,旨在为高维逃逸集的Hausdorff维数估计提供测度理论基础。通过构造由逆分支Λr生成的嵌套紧集族{Nn},定义了支撑在迭代逆像集上的概率测度序列{μn}。选取合适的紧集M⊂ℝ3...本文研究Zorich映射逆分支生成的紧集族上概率测度序列的弱收敛性,旨在为高维逃逸集的Hausdorff维数估计提供测度理论基础。通过构造由逆分支Λr生成的嵌套紧集族{Nn},定义了支撑在迭代逆像集上的概率测度序列{μn}。选取合适的紧集M⊂ℝ3,使得对于任意ò> 0,有μn(M) ≥ 1 − ò对所有n成立,从而证明该测度序列的紧性。再结合Prokhorov定理,得到该概率测度的弱收敛性,并进一步以正数序列rn(x)为桥梁建立定义在Kn(x)上的极限测度与Kn(x)直径之间的数量关系,为后续进一步估计以特定速度逃逸的点集的Hausdorff测度奠定基础。This paper investigates the weak convergence of sequences of probability measures supported on families of compact sets generated by inverse branches of Zorich maps, aiming to establish a measure-theoretic foundation for estimating the Hausdorff dimension of escaping sets in higher dimensions. By constructing a nested family of compact sets {Nn} induced by inverse branches Λr, we define a sequence of probability measures supported by iterated pre-image sets {μn}. Through the selection of appropriate compact sets M⊂ℝ3, we demonstrate that for any ò> 0, there exists μn(M) ≥ 1 − òfor all n, thereby proving the tightness of the measure sequence. Combining this with Prokhorov’s theorem, we establish the weak convergence of the probability measure sequence. Furthermore, using the positive integer sequence rn(x) as a bridge, the quantitative relationship between the limiting measure defined on Kn(x) and the diameter of Kn(x) is established. This lays the foundation for subsequent estimation of the Hausdorff measure of sets escaping at specific rates.展开更多
We study the conditional entropy of topological dynamical systems using a family of metrics induced by probability bi-sequences.We present a Brin-Katok formula by replacing the mean metric by a family of metrics induc...We study the conditional entropy of topological dynamical systems using a family of metrics induced by probability bi-sequences.We present a Brin-Katok formula by replacing the mean metric by a family of metrics induced by a probability bi-sequence.We also establish the Katok’s entropy formula for conditional entropy for ergodic measures in the case of the new family of metrics.展开更多
文摘本文主要研究拓扑空间中同伦的相关性质,进而讨论道路的逆及乘法运算,由此得到基本群,通过证明知基本群为拓扑不变量,最后利用基本群证明二维球面S2不同胚于环面T2。This article mainly studies the relevant properties of homotopy in topological spaces, and then discusses the inverse and multiplication operations of roads, thereby obtaining the fundamental group. By proving that the known fundamental group is a topological invariant, the fundamental group is finally used to prove that the two-dimensional sphere S2 is different from the torus T2.
文摘本文研究Zorich映射逆分支生成的紧集族上概率测度序列的弱收敛性,旨在为高维逃逸集的Hausdorff维数估计提供测度理论基础。通过构造由逆分支Λr生成的嵌套紧集族{Nn},定义了支撑在迭代逆像集上的概率测度序列{μn}。选取合适的紧集M⊂ℝ3,使得对于任意ò> 0,有μn(M) ≥ 1 − ò对所有n成立,从而证明该测度序列的紧性。再结合Prokhorov定理,得到该概率测度的弱收敛性,并进一步以正数序列rn(x)为桥梁建立定义在Kn(x)上的极限测度与Kn(x)直径之间的数量关系,为后续进一步估计以特定速度逃逸的点集的Hausdorff测度奠定基础。This paper investigates the weak convergence of sequences of probability measures supported on families of compact sets generated by inverse branches of Zorich maps, aiming to establish a measure-theoretic foundation for estimating the Hausdorff dimension of escaping sets in higher dimensions. By constructing a nested family of compact sets {Nn} induced by inverse branches Λr, we define a sequence of probability measures supported by iterated pre-image sets {μn}. Through the selection of appropriate compact sets M⊂ℝ3, we demonstrate that for any ò> 0, there exists μn(M) ≥ 1 − òfor all n, thereby proving the tightness of the measure sequence. Combining this with Prokhorov’s theorem, we establish the weak convergence of the probability measure sequence. Furthermore, using the positive integer sequence rn(x) as a bridge, the quantitative relationship between the limiting measure defined on Kn(x) and the diameter of Kn(x) is established. This lays the foundation for subsequent estimation of the Hausdorff measure of sets escaping at specific rates.
文摘We study the conditional entropy of topological dynamical systems using a family of metrics induced by probability bi-sequences.We present a Brin-Katok formula by replacing the mean metric by a family of metrics induced by a probability bi-sequence.We also establish the Katok’s entropy formula for conditional entropy for ergodic measures in the case of the new family of metrics.
