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Aug 17, 2013 at 17:29 comment added Neal Young sciencedirect.com/science/article/pii/S0022000097915348 "Size-estimation framework with applications to transitive closure and reachability"
Aug 16, 2013 at 18:34 answer added Vincent Beffara timeline score: 1
Aug 16, 2013 at 17:41 answer added The Masked Avenger timeline score: 1
Aug 16, 2013 at 16:26 comment added usul @Tino, ok, but if you are visiting $o(n)$ vertices and making $o(n)$ modifications (where $n$ is the number of vertices), it still seems very unlikely to me.
Aug 16, 2013 at 5:37 comment added tuna @usul: Remember that we can modify the graph locally, for example by deleting vertices we've visited.
Aug 16, 2013 at 1:39 comment added usul I'd guess that what you're asking is too difficult, unless we have a DAG. One intuition is that, if we cannot remember which vertices we've visited, then it will be difficult to distinguish between a small cycle and a very long line.
Aug 16, 2013 at 0:33 comment added tuna @Anton: I guess those are local modifications! But I'm looking for a method that will work when $G$ is too big to do, say, a number of operations as large as the number of vertices of $G$.
Aug 16, 2013 at 0:28 review First posts
Aug 16, 2013 at 0:33
Aug 16, 2013 at 0:21 comment added Anton Petrunin Move from $v_0$ to $v_1$, remove $v_0$ and connect all the vertices which were connected to $v_0$ by edges; move from $v_1$ to $v_2$ and so on as far as you can walk. The number of steps gives you the number of vertices in a connected graph.
Aug 16, 2013 at 0:08 history asked tuna CC BY-SA 3.0