# Diagram Coloring .

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Section 2.3 Graph Coloring. By Katie Lessard & Colleen Raimondi. a. b. c. Section 2.3 Graph Coloring. Coloring - a coloring of a graph G assigns colors to the vertices of G so that adjacent vertices are given different colors. . In the case of edge coloring, no edges that share a
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Slide 1

﻿Segment 2.3 Graph Coloring By Katie Lessard & Colleen Raimondi

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a b c Section 2.3 Graph Coloring - a shading of a diagram G doles out hues to the vertices of G so that nearby vertices are given distinctive hues. On account of edge shading, no edges that share a typical vertex can be a similar shading. a b d c d

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Section 2.3 Graph Coloring Chromatic number - the negligible number of hues in a diagram. a b d c The chromatic number for this diagram is 3. Note : Each shading class gives a free arrangement of (vertices without any edges between them).

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Section 2.3 Graph Coloring Note: to check that the chromatic number of a chart is a number k , we should likewise demonstrate that the diagram can not be appropriately shaded with k - 1 hues. As such the objective is to demonstrate that the ( k - 1)- shading we may develop for the chart must drive two nearby vertices to have a similar shading.

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Example 1 Pg. 77 in the content. Locate the chromatic number of the chart. The chromatic number is 4

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Example 2 Pg. 78 in the content. Locate the chromatic number of the chart. This type of chart is known as a wheel. The chromatic number is 4 when all is said in done, wheel diagrams with a much number of "spokes" can be 3-hued though wheels with an odd number of "spokes" require 4 hues.

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Example 3 Pg 79 in the content Problem: A state governing body has numerous councils that meet for one hour every week. One needs a calendar of board of trustees gatherings times that minimize the aggregate number of hours however to such an extent that two advisory groups with covering enrollment don\'t meet in the meantime. The chromatic number of this diagram is four. In this manner four hours suffice to timetable board of trustees gatherings without struggle.

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Class Work Problem (Pg. 83 #2 b.) For this diagram give the chromatic shading number for the vertices, the edges, and advise how this identifies with bipartite charts when all is said in done. Vertices hues = 2 Edge hues = 3 For bipartite charts as a rule, the edge shading is the level of the most elevated vertex, and the vertices shading is dependably 2.

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