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arXiv 1502.02549math.FA
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具有有界阻力度量的无限赋权图

Infinite weighted graphs with bounded resistance metric

Palle Jorgensen, Feng Tian

摘要:

我们考虑无限加权图$G$,即,顶点集$V$和边集$E$假定为可数无穷。权重的分配是关于$E$(边集)电导的正对称函数$c$。由此,人们自然地定义了可逆马尔可夫过程,以及作用于$V$上的函数、电压分布的相应拉普拉斯算子。调和函数具有特殊的重要性。我们建立了有限能量$G$上调和函数的显式边界表示。我们从给定的电导函数计算电阻度量$d$。(The两个顶点$x$和$y$之间的电阻距离$d(x,y)$是从$x$到$y$的电压降,当在顶点$x$插入1安培,然后在$y$再次提取时,该电压降由给定的电阻器分配引起。)我们研究的类模型,这个电阻度量是有界的。我们证明,然后有限能量函数形成一个代数的$\frac{1}{2}$ -Lipschitz连续和有界的功能在$V$,相对于度量$d$。我们进一步表明,在这种情况下,度量完成$M$的$(V,d)$是自动紧凑的,并且顶点集$V$是开放的$M$。得到了有限能量调和函数的Poisson边界表示和有限能量$V$上任意函数的插值公式。我们进一步比较$M$与其他紧化;例如,到某些路径空间模型。

英文摘要:

We consider infinite weighted graphs $G$, i.e., sets of vertices $V$, and edges $E$ assumed countable infinite. An assignment of weights is a positive symmetric function $c$ on $E$ (the edge-set), conductance. From this, one naturally defines a reversible Markov process, and a corresponding Laplace operator acting on functions on $V$, voltage distributions. The harmonic functions are of special importance. We establish explicit boundary representations for the harmonic functions on $G$ of finite energy. We compute a resistance metric $d$ from a given conductance function. (The resistance distance $d(x,y)$ between two vertices $x$ and $y$ is the voltage drop from $x$ to $y$, which is induced by the given assignment of resistors when 1 amp is inserted at the vertex $x$, and then extracted again at $y$.) We study the class of models where this resistance metric is bounded. We show that then the finite-energy functions form an algebra of $\frac{1}{2}$-Lipschitz-continuous and bounded functions on $V$, relative to the metric $d$. We further show that, in this case, the metric completion $M$ of $(V,d)$ is automatically compact, and that the vertex-set $V$ is open in $M$. We obtain a Poisson boundary-representation for the harmonic functions of finite energy, and an interpolation formula for every function on $V$ of finite energy. We further compare $M$ to other compactifications; e.g., to certain path-space models.

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