| 21. | Proved that the chromatic number of the graphs in the conjecture is at most, and improved this to.
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| 22. | It is in this sense that we view circular chromatic number as a refinement of the usual chromatic number.
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| 23. | It is in this sense that we view circular chromatic number as a refinement of the usual chromatic number.
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| 24. | It is a cubic graph with diameter 8, radius 7, chromatic number 2 and chromatic index 3.
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| 25. | The chromatic number of " G " is exactly 2; there is no vertex 1-coloring.
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| 26. | And its chromatic number is 4 : it can be colored using four colors, but not using only three.
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| 27. | It has chromatic number 3, chromatic index 3, radius 2, diameter 3 and edge-connected graph.
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| 28. | The Haj�s construction is a general method for constructing graphs with a given chromatic number, also due to Haj�s.
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| 29. | It has chromatic number 3, chromatic index 3, radius 6, diameter 6 and edge-connected graph.
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| 30. | He showed that in case of outerplanar graph of maximum degree 4, the incidence chromatic number is not 5.
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