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> in the sense that we have proved that in 3 dimensions a random walk will never return to it’s (sic.) starting point

We have? I believe the probability is ~34%. http://mathworld.wolfram.com/PolyasRandomWalkConstants.html



Sorry, I had it reversed in my head. For 1 and 2 dimensions they will return to the starting point with probability 1. For 3 dimensions it simply that it is not probability 1. Obviously a weaker result.




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