{hk | h ∈ H, k ∈ K}}
Elements Of Modern Algebra
8th Edition
ISBN:9781285463230
Author:Gilbert, Linda, Jimmie
Publisher:Gilbert, Linda, Jimmie
Chapter3: Groups
Section3.4: Cyclic Groups
Problem 41E: Let G be an abelian group. Prove that the set of all elements of finite order in G forms a subgroup...
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Let G be an abelian group and suppose that H and K are subgroups of G. Show that the following set is a subgroup of G:
{hk | h ∈ H, k ∈ K}}
can you prove this by showing it is closed, it has an inverse, and has the identity element without using the subgroup test?
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