28. Chromatic questions (ExH). Find the chromatic number for each graph below. (a) (b) (c) (d) Expanded Hint Remember that you want to find the smallest number of colors you need so that you can assign a color to each vertex in such a way that vertices joined by an edge get different colors. For graph (a), try a greedy approach. Pick a vertex and color it. Then go to that vertex's neighbors and color them a different color. Introduce a new color only if you need to. Reuse an old color whenever you can. How many colors have used when you're done? What about graph (b)? Does the same approach work? you

Advanced Engineering Mathematics
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ISBN:9780470458365
Author:Erwin Kreyszig
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Chapter2: Second-order Linear Odes
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28. Chromatic questions (ExH). Find the chromatic number for each graph below.
(a)
(b)
(c)
(d)
Expanded Hint
Remember that you want to find the smallest number of colors you need so that you
can assign a color to each vertex in such a way that vertices joined by an edge get
different colors. For graph (a), try a greedy approach. Pick a vertex and color it. Then
go to that vertex's neighbors and color them a different color. Introduce a new color
only if you need to. Reuse an old color whenever you can. How many colors have you
used when you're done? What about graph (b)? Does the same approach work?
Transcribed Image Text:28. Chromatic questions (ExH). Find the chromatic number for each graph below. (a) (b) (c) (d) Expanded Hint Remember that you want to find the smallest number of colors you need so that you can assign a color to each vertex in such a way that vertices joined by an edge get different colors. For graph (a), try a greedy approach. Pick a vertex and color it. Then go to that vertex's neighbors and color them a different color. Introduce a new color only if you need to. Reuse an old color whenever you can. How many colors have you used when you're done? What about graph (b)? Does the same approach work?
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