Find all the normal subgroups of D4.

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 35E: Show that An has index 2 in Sn, and thereby conclude that An is always a normal subgroup of Sn.
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3.4.1

Exercise 3.4.1 Find all the normal subgroups of D4.
Transcribed Image Text:Exercise 3.4.1 Find all the normal subgroups of D4.
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