Let G be a group and H, K are subgroups of G with HK=KH. Prove that HK is a subgroup of G.
Let G be a group and H, K are subgroups of G with HK=KH. Prove that HK is a subgroup of G.
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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