Inequalities for Means of Restricted First-Passage Times in Percolation Theory
Combinatorics, Probability and Computing
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Consider first-passage percolation on the square lattice. Welsh, who together with Hammersley introduced the subject in 1963, has formulated a problem about mean first-passage times, which, although seemingly simple, has not been proved in any non-trivial case. In this paper we give a general proof of Welsh's problem.