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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2. Let ø : G → G' be a homomorphism of groups, and let H be a subgroup of G.
(a) Let a E G. Prove that
$(a") = 4(a)" for all n e Z.
(b) Prove that if H is cyclic, then ø[H] is also cyclic.
(c) Prove that if H is normal in G and ø is onto, then ø[H]is normal in G'.
Transcribed Image Text:2. Let ø : G → G' be a homomorphism of groups, and let H be a subgroup of G. (a) Let a E G. Prove that $(a") = 4(a)" for all n e Z. (b) Prove that if H is cyclic, then ø[H] is also cyclic. (c) Prove that if H is normal in G and ø is onto, then ø[H]is normal in G'.
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