Introductory Combinatorics
5th Edition
ISBN: 9780136020400
Author: Richard A. Brualdi
Publisher: Prentice Hall
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Chapter 12, Problem 2E
To determine
To prove: The chromatic number of a disconnected graph is the largest of the chromatic numbers of its connected components.
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4. Find the general solution and the definite solution for the following differential equations:
(a)
+10y=15, y(0) = 0;
(b) 2 + 4y = 6, y(0) =
5) For each function represented by an equation, make a table and plot the corresponding
points to sketch the graph of the function.
(a) y = 75 ()*
220
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y
200-
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180
160
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140
0
120
100
1
60
80
2
3
4
x
(b) y = 20 ()*
1
60
40
20
20
0
2
3
65-
-1
X
y
60
-2
55-
50
45
44
40
0
35-
30
1
25
2
20
20
15
3
10
5
LO
4
3-2
T
-1
0
5-
4-
-3-
2-
5. Find the solution to each of the following by using an appropriate formula developed in the
lecture slides:
(a) + 3y = 2, y(0) = 4;
(b) dy - 7y = 7, y(0) = 7;
(c) 3d+6y= 5, y(0) = 0
Chapter 12 Solutions
Introductory Combinatorics
Ch. 12 - Prob. 1ECh. 12 - Prob. 2ECh. 12 -
Prove that the chromatic polynomial of a...Ch. 12 -
Prove that the chromatic number of a cycle graph...Ch. 12 - Prob. 5ECh. 12 -
Prove that a graph with chromatic number equal to...Ch. 12 - Prove that the greedy algorithm always produces a...Ch. 12 - Let G be a graph of order n ≥ 1 with chromatic...Ch. 12 - Let G be a graph of order n whose chromatic...Ch. 12 - Prob. 10E
Ch. 12 -
Prove that the chromatic polynomial of the graph...Ch. 12 -
What is the chromatic number of the graph...Ch. 12 - Prob. 13ECh. 12 -
Prove that the chromatic polynomial of a cycle...Ch. 12 - Prob. 15ECh. 12 -
Prove that the polynomial k4 − 4k3 + 3k2 is not...Ch. 12 - Prob. 17ECh. 12 -
Give an example of a planar graph with chromatic...Ch. 12 - A plane is divided into regions by a finite number...Ch. 12 - Prob. 22ECh. 12 - Prob. 23ECh. 12 - Prob. 26ECh. 12 - Let G be a planar graph of order n ≥ 2. Prove that...Ch. 12 - Find a solution to the problem of the 8 queens...Ch. 12 - Prob. 33ECh. 12 - Prob. 34ECh. 12 - Prob. 36ECh. 12 - Prob. 37ECh. 12 - Prob. 38ECh. 12 - Prob. 45ECh. 12 - Prove that the edge-connectivity of Kn equals n –...Ch. 12 - Prob. 53ECh. 12 - Prob. 54ECh. 12 - Prob. 55ECh. 12 - Determine the edge-connectivity of the complete...Ch. 12 - Prob. 63E
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