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Jul 4, 2011 at 18:47 vote accept Rorsa
May 23, 2011 at 22:54 answer added John Pardon timeline score: 2
May 21, 2011 at 19:20 comment added Ori Gurel-Gurevich Tom: it could be that the graph consists of 2 parts with 2 edges between them such that you would have to go through one of these edges, but neither is pivotal - removing either would not change the average at all.
May 21, 2011 at 16:30 comment added Tom Church An idle question: could it be true that if the average change in distance is low enough, then your graph is an expander? (This question will not help solve the original question, which is about efficiently computing the average change.)
May 21, 2011 at 15:39 history edited Rorsa CC BY-SA 3.0
added 134 characters in body; added 132 characters in body
May 21, 2011 at 15:33 history asked Rorsa CC BY-SA 3.0