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In [[group theory]], a '''locally cyclic group''' is a group (''G'', *) in which every [[generating set of a group|finitely generated subgroup]] is [[cyclic group|cyclic]].


==Some facts==
*Every cyclic group is locally cyclic, and every locally cyclic group is [[abelian group|abelian]].
*Every finitely-generated locally cyclic group is cyclic.
*Every [[subgroup]] and [[quotient group]] of a locally cyclic group is locally cyclic.
*Every [[homomorphism|Homomorphic]] image of a locally cyclic group is locally cyclic.
*A group is locally cyclic if and only if every pair of elements in the group generates a cyclic group.
*A group is locally cyclic if and only if its [[lattice of subgroups]] is [[distributive lattice|distributive]] {{harv|Ore|1938}}.
*The [[torsion-free rank]] of a locally cyclic group is 0 or 1.


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==Examples of locally cyclic groups that are not cyclic==
*The additive group of [[rational number]]s ('''Q''', +) is locally cyclic – any pair of rational numbers ''a''/''b'' and ''c''/''d'' is contained in the cyclic subgroup generated by 1/''bd''.
*The additive group of the [[dyadic rational number]]s, the rational numbers of the form ''a''/2<sup>''b''</sup>, is also locally cyclic – any pair of dyadic rational numbers ''a''/2<sup>''b''</sup> and ''c''/2<sup>''d''</sup> is contained in the cyclic subgroup generated by 1/2<sup>max(''b'',''d'')</sup>.
*Let ''p'' be any prime, and let μ<sub>''p''<sup></sup></sub> denote the set of all ''p''th-power [[root of unity|roots of unity]] in '''C''', i.e.
 
:<math>\mu_{p^{\infty}} = \left\{ \exp\left(\frac{2\pi im}{p^{k}}\right) : m,k\in\mathbb{Z}\right\}</math>
 
:Then &mu;<sub>''p''<sup>&infin;</sup></sub> is locally cyclic but not cyclic. This is the [[Prüfer group|Prüfer ''p''-group]]. The Prüfer 2-group is closely related to the dyadic rationals (it can be viewed as the dyadic rationals modulo 1).
 
==Examples of abelian groups that are not locally cyclic==
*The additive group of [[real number]]s ('''R''', +) is not locally cyclic—the subgroup generated by 1 and π consists of all numbers of the form ''a'' + ''b''π. This group is [[group isomorphism|isomorphic]] to the [[direct sum of groups|direct sum]] '''Z''' + '''Z''', and this group is not cyclic.
 
==References==
*{{citation
| last = Hall | first = Marshall, Jr. | author-link = Marshall Hall (mathematician)
| contribution = 19.2 Locally Cyclic Groups and Distributive Lattices
| isbn = 978-0-8218-1967-8
| pages = 340–341
| publisher = American Mathematical Society
| title = Theory of Groups
| year = 1999}}.
 
*{{citation
| last = Ore | first = Øystein | author-link = Øystein Ore
| doi = 10.1215/S0012-7094-38-00419-3
| mr = 1546048
| issue = 2
| journal = Duke Mathematical Journal
| pages = 247–269
| title = Structures and group theory. II
| volume = 4
| year = 1938}}.
 
[[Category:Abelian group theory]]

Revision as of 16:58, 25 January 2014

In group theory, a locally cyclic group is a group (G, *) in which every finitely generated subgroup is cyclic.

Some facts

  • Every cyclic group is locally cyclic, and every locally cyclic group is abelian.
  • Every finitely-generated locally cyclic group is cyclic.
  • Every subgroup and quotient group of a locally cyclic group is locally cyclic.
  • Every Homomorphic image of a locally cyclic group is locally cyclic.
  • A group is locally cyclic if and only if every pair of elements in the group generates a cyclic group.
  • A group is locally cyclic if and only if its lattice of subgroups is distributive Template:Harv.
  • The torsion-free rank of a locally cyclic group is 0 or 1.

Examples of locally cyclic groups that are not cyclic

  • The additive group of rational numbers (Q, +) is locally cyclic – any pair of rational numbers a/b and c/d is contained in the cyclic subgroup generated by 1/bd.
  • The additive group of the dyadic rational numbers, the rational numbers of the form a/2b, is also locally cyclic – any pair of dyadic rational numbers a/2b and c/2d is contained in the cyclic subgroup generated by 1/2max(b,d).
  • Let p be any prime, and let μp denote the set of all pth-power roots of unity in C, i.e.
μp={exp(2πimpk):m,k}
Then μp is locally cyclic but not cyclic. This is the Prüfer p-group. The Prüfer 2-group is closely related to the dyadic rationals (it can be viewed as the dyadic rationals modulo 1).

Examples of abelian groups that are not locally cyclic

  • The additive group of real numbers (R, +) is not locally cyclic—the subgroup generated by 1 and π consists of all numbers of the form a + bπ. This group is isomorphic to the direct sum Z + Z, and this group is not cyclic.

References

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    Naturally, you will have to pay a safety deposit and that is usually one month rent for annually of the settlement. That is the place your good religion deposit will likely be taken into account and will kind part or all of your security deposit. Anticipate to have a proportionate amount deducted out of your deposit if something is discovered to be damaged if you move out. It's best to you'll want to test the inventory drawn up by the owner, which can detail all objects in the property and their condition. If you happen to fail to notice any harm not already mentioned within the inventory before transferring in, you danger having to pay for it yourself.

    In case you are in search of an actual estate or Singapore property agent on-line, you simply should belief your intuition. It's because you do not know which agent is nice and which agent will not be. Carry out research on several brokers by looking out the internet. As soon as if you end up positive that a selected agent is dependable and reliable, you can choose to utilize his partnerise in finding you a home in Singapore. Most of the time, a property agent is taken into account to be good if he or she locations the contact data on his website. This may mean that the agent does not mind you calling them and asking them any questions relating to new properties in singapore in Singapore. After chatting with them you too can see them in their office after taking an appointment.

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