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Feb 17, 2021 at 8:34 comment added username Thanks for your answer. I'm concerned that after multiplying by $G_0(0)$ this only proves that $G_0(x)$ is less than the sum of the neighbouring entries (which also follows from $G_0$ being harmonic away from $0$).
Feb 17, 2021 at 8:15 history answered mike CC BY-SA 4.0