Every exponential group supports a positive harmonic function

Every exponential group supports a positive harmonic function
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每个指数群都支持正调和函数

DOI:
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发表时间:
2017
影响因子:
1
通讯作者:
G. Kozma
G. Kozma
中科院分区:
数学3区
文献类型:
--
作者:
Gideon Amir;G. Kozma

文献摘要

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我们证明了所有的指数增长群都支持非常数的正调和函数。事实上,我们的结果在更一般的情况下,强连接,支持马尔可夫链不变的一些传递群的自同构,有向球指数增长。
We prove that all groups of exponential growth support non-constant positive harmonic functions. In fact, out results hold in the more general case of strongly connected, finitely supported Markov chains invariant under some transitive group of automorphisms for which the directed balls grow exponentially.