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Jun 18, 2021 at 6:00 comment added Shaull @Null_Space - an undirected graph is a special case of a directed graph (with the edge relation is symmetric). Also, an undirected graph has a cycle iff it has an edge, because you can go back and forth.
Jun 17, 2021 at 20:50 comment added Null_Space I think your algorithm only works when the underlying graph is directed
May 20, 2016 at 21:39 history answered Shaull CC BY-SA 3.0