# What is the chromatic number of K?

## What is the chromatic number of K?

is said to be a k-colorable graph. A graph is one-colorable iff it is totally disconnected (i.e., is an empty graph). ., 5 nodes are illustrated above. , 4, and 5 nodes are illustrated above….k-Chromatic Graph.

OEIS | labeled simple graphs on , 2, nodes having | |
---|---|---|

4 | A084272 | 0, 0, 0, 1, 65, 5042. |

5 | 0, 0, 0, 0, 1, 171. |

### What is K in a graph?

The value of k is the vertical (y) location of the vertex and h the horizontal (x-axis) value.

#### What is chromatic graph?

For any positive integer , a -distance coloring of a graph is a vertex coloring of in which no two vertices at distance less than or equal to receive the same color. The -distance chromatic number of , denoted by χ k G is the smallest integer for which has a -distance -coloring.

**What will be the chromatic number of the following graph KN?**

What will be the chromatic number of the following graph? Explanation: The given graph will only require 2 unique colors so that no two vertices connected by a common edge will have the same color. So its chromatic number will be 2.

**What is the chromatic number of Petersen graph?**

3

The Petersen graph has chromatic number 3, meaning that its vertices can be colored with three colors — but not with two — such that no edge connects vertices of the same color.

## What does K represent in a function?

y = kx. where k is the constant of variation. Since k is constant (the same for every point), we can find k when given any point by dividing the y-coordinate by the x-coordinate. For example, if y varies directly as x, and y = 6 when x = 2, the constant of variation is k = = 3.

### What is a 4 chromatic graph?

In the mathematical field of graph theory, the Grötzsch graph is a triangle-free graph with 11 vertices, 20 edges, chromatic number 4, and crossing number 5. It is named after German mathematician Herbert Grötzsch.

#### What is chromatic index of following graph?

What is a chromatic index? Explanation: The minimum number of colors required for proper edge coloring of graph is called chromatic index whereas the minimum number of colors required for proper vertex coloring of graph is called chromatic number of a graph.

**What is chromatic number of K5?**

In this paper, we offer the following partial result: The chromatic number of a random lift of K5 \ e is a.a.s. three. We actually prove a stronger statement where K5 \ e can be replaced by a graph obtained from joining a cycle to a stable set.

**Does every k-chromatic graph have a Kk -minor?**

Received April 16, 2002 In 1943, Hadwiger made the conjecture that every k-chromatic graph has a Kk -minor. This conjecture is, perhaps, the most interesting conjecture of all graph theory. It is well known that the case k = 5 is equivalent to the Four Colour Theorem, as proved by Wagner [39] in 1937.

## Is the chromatic function of a graph a polynomial?

The Chromatic Polynomial for G eis more dicult to compute, however we can use our recursion formula to nd that P. G G=ee(k) = P. G(k)+P (k) = k(k 1)(k 2)(k 3)+k(k 1)(k 2) = k(k 1)(k 2)2; as expected. With Theorem 1, we can now prove that the Chromatic Function of a graph G is a polynomial.

### Is K = 6 equivalent to the four colour theorem?

It is well known that the case k = 5 is equivalent to the Four Colour Theorem, as proved by Wagner [39] in 1937. About 60 years later, Robertson, Seymour and Thomas [29] proved that the case k = 6 is also equivalent to the Four Colour Theorem.

#### What is a proper coloring of a graph?

The vertices of the graph in Figure 1 have been colored in the desired manner. This is called a Proper Coloring of the graph. Frequently, we are concerned with determining the least number of colors with which we can achieve a proper coloring on a graph.