Contemporary Abstract Algebra
9th Edition
ISBN: 9781305657960
Author: Joseph Gallian
Publisher: Cengage Learning
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Textbook Question
Chapter 6, Problem 67E
Give a group theoretic proof that Q under addition is not isomorphicto
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Chapter 5 Test Form A
of 2
-
ZOOM
+ |
Find any real numbers for which each expression is undefined.
2x 4
1.
x
Name:
Date:
1.
3.x-5
2.
2.
x²+x-12
4x-24
3. Evaluate
when x=-3.
3.
x
Simplify each rational expression.
x²-3x
4.
2x-6
5.
x²+3x-18
x²-9
6. Write an equivalent rational expression with the given
denominator.
2x-3
x²+2x+1(x+1)(x+2)
Perform the indicated operation and simplify if possible.
x²-16 x-3
7.
3x-9 x²+2x-8
x²+9x+20 5x+25
8.
4.x
2x²
9.
x-5 x-5
3
5
10.
4x-3
8x-6
2
3
11.
x-4 x+4
x
12.
x-2x-8 x²-4
←
->
Copyright ©2020 Pearson Education, Inc.
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T-97
Problem #5
Suppose you flip a two sided fair coin ("heads" or "tails") 8 total times.
a). How many ways result in 6 tails and 2 heads?
b). How many ways result in 2 tails and 6 heads?
c). Compare your answers to part (a) and (b) and explain in a few sentences why the
comparison makes sense.
A local company has a 6 person management team and 20 employees. The company needs to select 3 people from the management team and 7 employees to attend a regional meeting. How many different possibilities are there for the group that can be sent to the regional meeting?
Chapter 6 Solutions
Contemporary Abstract Algebra
Ch. 6 - Prob. 1ECh. 6 - Find Aut(Z).Ch. 6 - Let R+ be the group of positive real numbers under...Ch. 6 - Show that U(8) is not isomorphic to U(10).Ch. 6 - Show that U(8) is isomorphic to U(12).Ch. 6 - Prove that isomorphism is an equivalence relation....Ch. 6 - Prove that S4 is not isomorphic to D12 .Ch. 6 - Show that the mapping alog10a is an isomorphism...Ch. 6 - In the notation of Theorem 6.1, prove that Te is...Ch. 6 - Given that is a isomorphism from a group G under...
Ch. 6 - Let G be a group under multiplication, G be a...Ch. 6 - Let G be a group. Prove that the mapping (g)=g1...Ch. 6 - Prob. 13ECh. 6 - Find two groups G and H such that GH , but...Ch. 6 - Prob. 15ECh. 6 - Find Aut(Z6) .Ch. 6 - If G is a group, prove that Aut(G) and Inn(G) are...Ch. 6 - If a group G is isomorphic to H, prove that Aut(G)...Ch. 6 - Suppose belongs to Aut(Zn) and a is relatively...Ch. 6 - Let H be the subgroup of all rotations in Dn and...Ch. 6 - Let H=S5(1)=1andK=S5(2)=2 . Provethat H is...Ch. 6 - Show that Z has infinitely many subgroups...Ch. 6 - Prob. 23ECh. 6 - Let be an automorphism of a group G. Prove that...Ch. 6 - Prob. 25ECh. 6 - Suppose that :Z20Z20 is an automorphismand (5)=5 ....Ch. 6 - Identify a group G that has subgroups isomorphic...Ch. 6 - Prove that the mapping from U(16) to itself given...Ch. 6 - Let rU(n) . Prove that the mapping a: ZnZn defined...Ch. 6 - The group {[1a01]|aZ} is isomorphic to what...Ch. 6 - If and are isomorphisms from the cyclic group a...Ch. 6 - Prob. 32ECh. 6 - Prove property 1 of Theorem 6.3. Theorem 6.3...Ch. 6 - Prove property 4 of Theorem 6.3. Theorem 6.3...Ch. 6 - Referring to Theorem 6.1, prove that Tg is indeed...Ch. 6 - Prove or disprove that U(20) and U(24) are...Ch. 6 - Show that the mapping (a+bi)=a=bi is an...Ch. 6 - Let G={a+b2a,barerational} and...Ch. 6 - Prob. 39ECh. 6 - Explain why S8 contains subgroups isomorphic to...Ch. 6 - Let C be the complex numbers and M={[abba]|a,bR} ....Ch. 6 - Prob. 42ECh. 6 - Prob. 43ECh. 6 - Suppose that G is a finite Abelian group and G has...Ch. 6 - Prob. 45ECh. 6 - Prob. 46ECh. 6 - Suppose that g and h induce the same inner...Ch. 6 - Prob. 48ECh. 6 - Prob. 49ECh. 6 - Prob. 50ECh. 6 - Prob. 51ECh. 6 - Let G be a group. Complete the following...Ch. 6 - Suppose that G is an Abelian group and is an...Ch. 6 - Let be an automorphismof D8 . What are the...Ch. 6 - Let be an automorphism of C*, the group of...Ch. 6 - Let G=0,2,4,6,...andH=0,3,6,9,... .Prove that G...Ch. 6 - Give three examples of groups of order 120, no two...Ch. 6 - Let be an automorphism of D4 such that (H)=D ....Ch. 6 - Prob. 59ECh. 6 - Prob. 60ECh. 6 - Write the permutation corresponding to R90 in the...Ch. 6 - Show that every automorphism of the rational...Ch. 6 - Prove that Q+ , the group of positive rational...Ch. 6 - Prob. 64ECh. 6 - Prob. 65ECh. 6 - Prove that Q*, the group of nonzero rational...Ch. 6 - Give a group theoretic proof that Q under addition...
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