Advanced Engineering Mathematics
Advanced Engineering Mathematics
10th Edition
ISBN: 9780470458365
Author: Erwin Kreyszig
Publisher: Wiley, John & Sons, Incorporated
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Exercise 7.11. Suppose that H and K are subgroups G.
(a) Prove that HK
H if and only if K CH.
(b) Suppose that N≤ G, |G| < ∞, and H ≤ G. If |G/N| is prime, prove that H C N or NH = G.
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Transcribed Image Text:Exercise 7.11. Suppose that H and K are subgroups G. (a) Prove that HK H if and only if K CH. (b) Suppose that N≤ G, |G| < ∞, and H ≤ G. If |G/N| is prime, prove that H C N or NH = G. -
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