If H and K are subgroups of a group G, let (H,K) be the subgroup of G
Question:
If H and K are subgroups of a group G, let (H,K) be the subgroup of G generated by the elements { hkh-1k1| h ϵ H, k ϵ K}. Show that
{a) (H,K) is normal in H V K.
(b) If (H,G') = (e), then (H',G) = (e). (c) H
(c) H ⊲ G if and only if (H,G) < H.
(d) Let K ⊲ G and K < H; then H/K < C(G/K) if and only if (H,G) < K.
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a To show that HK is normal in H V K we need to show that for any element g in H V K gHKg1 is contai...View the full answer
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Related Book For
Algebra Graduate Texts In Mathematics 73
ISBN: 9780387905181
8th Edition
Authors: Thomas W. Hungerford
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