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PageRank is a ranking method that assigns scores to web pages using the limit
distribution of a random walk on the web graph. A of graphs is a
morphism that is a local isomorphism of in-neighbourhoods, much in the same way
a covering projection is a local isomorphism of neighbourhoods. We show that a
deep connection relates fibrations and , a
particular kind of Markov chains that include the PageRank one as a
special case. This fact provides constraints on the values that PageRank can
assume....
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