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Let K={β∈S5∣β(1)=2 and β(4)=4}K={β∈S5∣β(1)=2 and β(4)=4}. Prove that KK is not a subgroup of S5.

Elements Of Modern Algebra

8th Edition

ISBN:9781285463230

Author:Gilbert, Linda, Jimmie

Publisher:Gilbert, Linda, Jimmie

Chapter4: More On Groups

Section4.4: Cosets Of A Subgroup

Problem 25E: If H and K are arbitrary subgroups of G, prove that HK=KH if and only if HK is a subgroup of G.

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Question

Let K={β∈S5∣β(1)=2 and β(4)=4}K={β∈S5∣β(1)=2 and β(4)=4}. Prove that KK is not a subgroup of S5.

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