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# Herstein's Restrictions

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• #29357
SaSA :::::
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<p style=”text-align: left;”>Let G be a group of order pq, where p>q are primes. Prove that if q doesn’t divide p-1, then G is cyclic, without using Sylow theorems. (You can only use material developed up to section 2.9 of IN.Herstein.)</p>

#29562
Srijit Mukherjee
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#29955
SaSA :::::
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Thanks, I saw this, but the problem is that Herstein has not introduced much of these ideas up to this problem. I found something different, it goes like this, center Z of G has order either 1 or pq, if q doesn’t divide p-1 it can be shown that a normal subgroup of order p is contained in Z, therefore Z=G, so G is abelian and it has an element of order pq.

• This reply was modified 10 months, 2 weeks ago by SaSA :::::.
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