Примери коришћења Chromatic number на Енглеском и њихови преводи на Српски
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A k-degenerate graph has chromatic number at most k+ 1;
The chromatic number is the minimum number of such sets.
A graph is k-chromatic if its chromatic number is equal to k.
The chromatic number of G is exactly 2; there is no vertex 1-coloring.
A graph is strongly k-chromatic if it has strong chromatic number k.
The inequality between coloring and chromatic numbers holds also in this infinite setting;
In particular, it is NP-hard to compute the chromatic number.
The total chromatic number χ″(G) of a graph G is the fewest colors needed in any total coloring of G.
Graphs with large cliques have a high chromatic number, but the opposite is not true.
The minimal number of colors needed to color a graph is known as its chromatic number.
From Brooks's theorem,graphs with high chromatic number must have high maximum degree.
The chromatic number of the graph is exactly the minimum makespan, the optimal time to finish all jobs without conflicts.
Another local property that leads to high chromatic number is the presence of a large clique.
Since chromatic number is an upper bound on the order of the maximum clique, the latter invariant is also at most degeneracy plus one.
The minimum number of colors needed to paint G is called the chromatic number of G and is denoted by χ(G).
It should be distinguished from the chromatic number of G, the minimum number of colors needed to color the vertices so that no two adjacent vertices have the same color;
The chromatic polynomial includes at least as much information about the colorability of G as does the chromatic number.
An odd cycle of length greater than 3 cannot be perfect, because its chromatic number is three and its clique number is two.
In all graphs, the clique number provides a lower bound for the chromatic number, as all vertices in a clique must be assigned distinct colors in any proper coloring.
The smallest number of colors needed for an edge coloring of a graph G is the chromatic index, or edge chromatic number, χ′(G).
The chromatic index should not be confused with the chromatic number χ(G) or χ0(G), the minimum number of colors needed in a proper vertex coloring of G.
Via this theorem, similar bounds in extremal graph theory can be proven for any excluded subgraph,depending on the chromatic number of the subgraph.
The inequality between coloring and chromatic numbers holds also in this infinite setting; Erdős& Hajnal(1966) state that, at the time of publication of their paper, it was already well known.
Similarly, the complement of an odd cycle of length 2k+ 1 cannot be perfect, because its chromatic number is k+ 1 and its clique number is k.
For graphs that are not perfect, the chromatic number and clique number can differ; for instance, a cycle of length five requires three colors in any proper coloring but its largest clique has size two.
But colorability is not an entirely local phenomenon: A graph with high girth looks locally like a tree,because all cycles are long, but its chromatic number need not be 2.
Thus, perfection(defined as the equality of maximum clique size and chromatic number in every induced subgraph) is equivalent to the equality of maximum independent set size and clique cover number. .
The ordering which determines the coloring number provides an order to color the vertices of G with the coloring number, but in general the chromatic number may be smaller.
Perfection of bipartite graphs is easy to see(their chromatic number is two and their maximum clique size is also two) but perfection of the complements of bipartite graphs is less trivial, and is another restatement of König's theorem.