Question
Asked Sep 22, 2019
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Find all normal subgroups of G where
(a) G = S3,

(b) G = D4, the group of symmetries of the square,

(c) G = Q4, the quaternion group

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Expert Answer

Step 1

To find all the normal subgroups of the given (three) groups

Step 2

(a) the only normal subgroups are the triivial, the alternating and the whole group

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(a)G S, permutation group on 3 symbols - e.(12), (13). (23), (123). (132) Let N 4 G,(normal) claim N e, {e,(123).(132)},or G Proof If (12) N, then (123)(12)(132) N (as N G) (23) E N.Similarly.(13) E N Hence (12)(13) (132) e N (123) N Thus,N G Hence,the claim.

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Step 3

There are five normal subgroups of G. The obvious ones are the identity, the subgroup generated by the rotation R , (as it is a subgroup of order 2 in G), and t...

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(b)G D, {e.R.R, R',S,SR. SR* ,SR} with relations R = e,S2 = e and SRS SRS = R Let N G,(normal) Then N e e,R, R2 R}, {e, R},(e,SR'}, G.

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