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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Students have asked these similar questions
Let the universal set be whole numbers 1
through 20 inclusive. That is,
U = {1, 2, 3, 4, . . ., 19, 20}. Let A, B, and C
be subsets of U.
Let A be the set of all prime numbers:
A = {2, 3, 5, 7, 11, 13, 17, 19}
Let B be the set of all odd numbers:
B = {1,3,5,7, . . ., 17, 19}
Let C be the set of all square numbers:
C = {1,4,9,16}
A research team consists of 4 senior researchers and 10 research assistants. The team needs to select 2 senior researchers and 2 research assistants to attend a conference. How many different ways can the group being sent to the conference be formed?
There are 25 different varieties of flowering plants found in a natural habitat you are studying. You are asked to randomly select 5 of these flowering plant varieties to bring back to your laboratory for further study.
How many different combinations of are possible? That is, how many possible 5 plant subgroups can be formed out of the 25 total plants found?
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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