Problem 4. A group G is called cyclic if G = (g) for some g = G. 4.1. Suppose that G and H are two groups, and that : G → H is an isomorphism. Prove that the group G is cyclic if and only if H is cyclic.¹ 4.2. In each of the following, prove that the two given groups are not isomorphic: a) Z/16Z and D8. b) Z/2ZZ/2Z × Z/2Z and Z/3Z × Z/2Z.

Elements Of Modern Algebra
8th Edition
ISBN:9781285463230
Author:Gilbert, Linda, Jimmie
Publisher:Gilbert, Linda, Jimmie
Chapter3: Groups
Section3.1: Definition Of A Group
Problem 44E: Let A={ a,b,c }. Prove or disprove that P(A) is a group with respect to the operation of union....
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Problem 4. A group G is called cyclic if G = (g) for some g = G.
4.1. Suppose that G and H are two groups, and that : G → H is an isomorphism.
Prove that the group G is cyclic if and only if H is cyclic.¹
4.2. In each of the following, prove that the two given groups are not isomorphic:
a) Z/16Z and D8.
b) Z/2ZZ/2Z × Z/2Z and Z/3Z × Z/2Z.
Transcribed Image Text:Problem 4. A group G is called cyclic if G = (g) for some g = G. 4.1. Suppose that G and H are two groups, and that : G → H is an isomorphism. Prove that the group G is cyclic if and only if H is cyclic.¹ 4.2. In each of the following, prove that the two given groups are not isomorphic: a) Z/16Z and D8. b) Z/2ZZ/2Z × Z/2Z and Z/3Z × Z/2Z.
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