Abstract
We prove that the positive harmonic functions for symmetric or centered probability measures on countable groups of polynomial growth are constant.
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Bruce Erickson, K. The strong liouville property for a class of random walks. Monatshefte für Mathematik 109, 237–246 (1990). https://doi.org/10.1007/BF01297763
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DOI: https://doi.org/10.1007/BF01297763