A graph is k-critical if x(G) = k and if the deletion of any vertex yields a graph with smaller chromatic number. The ch
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A graph is k-critical if x(G) = k and if the deletion of any vertex yields a graph with smaller chromatic number. The ch
A graph is k-critical if x(G) = k and if the deletion of any vertex yields a graph with smaller chromatic number. The chromatic number is the minimum number of colors needed for a vertex coloring of the graph. (a) Find all 2-critical and 3-critical graphs. (b) Give an example of a 4-critical graph. a
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