2. Let o : G → G' be a homomorphism of groups, and let H be a subgroup of G. (a) Let a E G. Prove that $(a") = ¢(a)" for all n e Z. (b) Prove that if H is cyclic, then o[H] is also cyclic. (c) Prove that if H is normal in G and o is onto, then [H] is normal in G'.
2. Let o : G → G' be a homomorphism of groups, and let H be a subgroup of G. (a) Let a E G. Prove that $(a") = ¢(a)" for all n e Z. (b) Prove that if H is cyclic, then o[H] is also cyclic. (c) Prove that if H is normal in G and o is onto, then [H] is normal in G'.
Elements Of Modern Algebra
8th Edition
ISBN:9781285463230
Author:Gilbert, Linda, Jimmie
Publisher:Gilbert, Linda, Jimmie
Chapter4: More On Groups
Section4.5: Normal Subgroups
Problem 7E: Let H be a torsion subgroup of an abelian group G. That is, H is the set of all elements of finite...
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