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The reason why the decomposition intobiconnectedcomponents of a graph is so useful is thatbiconnectedouterplanar graphs have a simple structure.
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Any connected graph decomposes into a tree ofbiconnectedcomponents called the block tree of the graph.
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Abiconnectedcomponent is a 2-connected component.
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Similarly, a directed graph isbiconnectedif, for every two vertices, there exists a simple cycle in the graph containing both of them.
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Therefore, if the cycle double cover conjecture is true, everybiconnectedgraph has a circular embedding.
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The circular embedding conjecture or strong embedding conjecture states that everybiconnectedgraph has a circular embedding onto a manifold.
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A 1-connected graph is called connected; a 2-connected graph is calledbiconnected.
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