12. If a group G has exactly one subgroup H of order k, prove that H is normal in G.

Elements Of Modern Algebra
8th Edition
ISBN:9781285463230
Author:Gilbert, Linda, Jimmie
Publisher:Gilbert, Linda, Jimmie
Chapter3: Groups
Section3.3: Subgroups
Problem 34E: 34. Suppose that and are subgroups of the group . Prove that is a subgroup of .
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12. If a group G has exactly one subgroup H of order k, prove that H is normal in
G.
Transcribed Image Text:12. If a group G has exactly one subgroup H of order k, prove that H is normal in G.
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