Contemporary Abstract Algebra
9th Edition
ISBN: 9781305657960
Author: Joseph Gallian
Publisher: Cengage Learning
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Chapter 9, Problem 9E
Prove that if H has index 2 in G, then H is normal in G. (This exerciseis referred to in Chapters 24 and 25 and this chapter.)
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Question 1. Solve the system
-
x1 x2 + 3x3 + 2x4
-x1 + x22x3 + x4
2x12x2+7x3+7x4
Question 2. Consider the system
= 1
=-2
= 1
3x1 - x2 + ax3
= 1
x1 + 3x2 + 2x3
x12x2+2x3
= -b
= 4
1 For what values of a, b will the system be inconsistent?
2 For what values of a, b will the system have only one solution?
For what values of a, b will the saystem have infinitely many solutions?
Chapter 9 Solutions
Contemporary Abstract Algebra
Ch. 9 - Let H={(1),(12)} . Is H normal in S3 ?Ch. 9 - Prove that An is normal in Sn .Ch. 9 - Let H={[ab0d]|a,b,dR,ad0} .IsH a normal subgroupof...Ch. 9 - Let G=GL(2,R) and let K be a subgroup of R*. Prove...Ch. 9 - Viewing 3and12 as subgroups of Z, prove that 3/12...Ch. 9 - Prove that if H has index 2 in G, then H is normal...Ch. 9 - Prove that a factor group of a cyclic group is...Ch. 9 - Prove that a factor group of an Abelian group is...Ch. 9 - Prob. 17ECh. 9 - Determine the order of (ZZ)/(2,2) . Is the group...
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