Collisions among random walks on a graph
SIAM Journal on Discrete Mathematics
Dependent percolation and colliding random walks
Random Structures & Algorithms
The Clairvoyant Demon Has a Hard Task
Combinatorics, Probability and Computing
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Two infinite walks on the same finite graph are called compatible if it is possible to introduce delays into them in such a way that they never collide. About 10 years ago, Peter Winkler asked the question: for which graphs are two independent walks compatible with positive probability. Up to now, no such graphs were found. We show in this paper that large complete graphs have this property. The question is equivalent to a certain dependent percolation with a power-law behavior: the probability that the origin is blocked at distance n but not closer decreases only polynomially fast and not, as usual, exponentially.