| 1. | Thus, symmetric relations and undirected graphs are combinatorially equivalent objects.
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| 2. | Note 2 : For undirected groups, Coxeter diagrams are interchangeable.
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| 3. | In the planar undirected graph with 5 vertices and 6 edges.
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| 4. | The graph may be interpreted as a directed or undirected graph.
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| 5. | In the planar undirected graph with 4 vertices and 5 edges.
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| 6. | In the regular undirected graph with 81 vertices and 810 edges.
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| 7. | In the regular undirected graph with 27 vertices and 216 edges.
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| 8. | An undirected graph is complement of any perfect graph is also perfect.
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| 9. | Hence, undirected graph connectivity may be solved in space.
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| 10. | Directed because it supports directed edges as well as undirected.
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