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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.

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
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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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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