4 Coloring Np Hard. You just go through all the patches check that the neighbors are of. The reduction maps a graph ji into a. If you had an algorithm to solve 4-coloring you could use it to test if a graph G is 3-colorable by adding a vertex adjacent to all others and. For a check you are given with a particular coloring of the given map. We give a new proof showing that it is NP-hard to color a 3.

If you had an algorithm to solve 4-coloring you could use it to test if a graph G is 3-colorable by adding a vertex adjacent to all others and. For a check you are given with a particular coloring of the given map. We give a polynomial-time reduction from 3-COLOR to 4-COLOR. The reduction maps a graph ji into a. We give a new proof showing that it is NP-hard to color a 3.
We give a new proof showing that it is NP-hard to color a 3.
For a check you are given with a particular coloring of the given map. We give a new proof showing that it is NP-hard to color a 3. We give a polynomial-time reduction from 3-COLOR to 4-COLOR. If you had an algorithm to solve 4-coloring you could use it to test if a graph G is 3-colorable by adding a vertex adjacent to all others and. The reduction maps a graph ji into a. For a check you are given with a particular coloring of the given map. You just go through all the patches check that the neighbors are of.