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In mathematics, the '''intermediate Jacobian''' of a compact [[Kähler manifold]] or [[Hodge structure]] is a [[complex torus]] that is a common generalization of the [[Jacobian variety]] of a curve and the  [[Picard variety]] and the [[Albanese variety]]. It is obtained by putting a [[complex manifold|complex structure]] on the torus ''H''<sup>''n''</sup>(M,'''R''')/''H''<sup>''n''</sup>(M,'''Z''') for ''n'' odd. There are several different natural ways to put a complex structure on this torus,  giving several different sorts of intermediate Jacobians, including one due to {{harvs|txt|authorlink=André Weil|last=Weil|year=1952}} and one due to {{harvs|txt|authorlink=Phillip Griffiths|last=Griffiths|year1=1968|year2=1968b}}. The ones constructed by Weil have natural polarizations if ''M'' is projective, and so are abelian varieties, while the ones constructed by Griffiths behave well under [[holomorphic deformation]]s.
 
A complex structure on a real vector space is given by an automorphism ''I'' with square &minus;1.
The complex structures on ''H''<sup>''n''</sup>(M,'''R''') are defined using the [[Hodge decomposition]]
 
:<math> H^{n}(M,{ R}) \otimes { C}  = H^{n,0}(M)\oplus\cdots\oplus H^{0,n}(M). \, </math>
 
On ''H''<sup>''p'',''q''</sup>  the Weil complex structure ''I''<sub>''W''</sub> is multiplication by ''i''<sup>''p''&minus;''q''</sup>, while the Griffiths complex structure ''I''<sub>''G''</sub> is multiplication by ''i'' if ''p''&nbsp;>&nbsp;''q'' and &minus;''i'' if ''p''&nbsp;<&nbsp;''q''. Both these complex structures map ''H''<sup>''n''</sup>(M,'''R''') into itself and so defined complex structures on it.
 
For ''n''&nbsp;=&nbsp;1 the intermediate Jacobian is the [[Picard variety]], and for ''n''&nbsp;=&nbsp;2&nbsp;dim(''M'')&nbsp;&minus;&nbsp;1 it is the [[Albanese variety]]. In these two extreme cases the constructions of Weil and Griffiths are equivalent.
 
{{harvtxt|Clemens|Griffiths|1972}} used intermediate Jacobians to show that non-singular [[cubic threefold]]s are not [[rational variety|rational]], even though they are [[unirational]].
 
==References==
*{{Citation | last1=Clemens | first1=C. Herbert | last2=Griffiths | first2=Phillip A. | title=The intermediate Jacobian of the cubic threefold | id={{MathSciNet | id = 0302652}} | year=1972 | journal=[[Annals of Mathematics|Annals of Mathematics. Second Series]] | issn=0003-486X | volume=95 | pages=281–356 | doi=10.2307/1970801 | issue=2 | jstor=1970801}}
*{{Citation | last1=Griffiths | first1=Phillip A. | title=Periods of integrals on algebraic manifolds. I. Construction and properties of the modular varieties | id={{MathSciNet | id = 0229641}} | year=1968 | journal=[[American Journal of Mathematics]] | issn=0002-9327 | volume=90 | pages=568–626 | doi=10.2307/2373545 | issue=2 | jstor=2373545}}
*{{Citation | last1=Griffiths | first1=Phillip A. | title=Periods of integrals on algebraic manifolds. II. Local study of the period mapping | id={{MathSciNet | id = 0233825}} | year=1968b | journal=[[American Journal of Mathematics]] | issn=0002-9327 | volume=90 | pages=805–865 | doi=10.2307/2373485 | issue=3 | jstor=2373485}}
*{{Citation | last1=Griffiths | first1=Phillip | author1-link=Phillip Griffiths | last2=Harris | first2=Joseph | author2-link=Joe Harris (mathematician) | title=Principles of algebraic geometry | publisher=[[John Wiley & Sons]] | location=New York | series=Wiley Classics Library | isbn=978-0-471-05059-9 | id={{MathSciNet | id = 1288523}} | year=1994}}
*{{eom|id=i/i051870|first=Vik.S.|last= Kulikov}}
*{{Citation | last1=Weil | first1=André | author1-link=André Weil | title=On Picard varieties | id={{MathSciNet | id = 0050330}} | year=1952 | journal=[[American Journal of Mathematics]] | issn=0002-9327 | volume=74 | pages=865–894 | doi=10.2307/2372230 | issue=4 | jstor=2372230}}
[[Category:Hodge theory]]

Revision as of 13:30, 29 January 2014

In mathematics, the intermediate Jacobian of a compact Kähler manifold or Hodge structure is a complex torus that is a common generalization of the Jacobian variety of a curve and the Picard variety and the Albanese variety. It is obtained by putting a complex structure on the torus Hn(M,R)/Hn(M,Z) for n odd. There are several different natural ways to put a complex structure on this torus, giving several different sorts of intermediate Jacobians, including one due to Template:Harvs and one due to Template:Harvs. The ones constructed by Weil have natural polarizations if M is projective, and so are abelian varieties, while the ones constructed by Griffiths behave well under holomorphic deformations.

A complex structure on a real vector space is given by an automorphism I with square −1. The complex structures on Hn(M,R) are defined using the Hodge decomposition

On Hp,q the Weil complex structure IW is multiplication by ipq, while the Griffiths complex structure IG is multiplication by i if p > q and −i if p < q. Both these complex structures map Hn(M,R) into itself and so defined complex structures on it.

For n = 1 the intermediate Jacobian is the Picard variety, and for n = 2 dim(M) − 1 it is the Albanese variety. In these two extreme cases the constructions of Weil and Griffiths are equivalent.

Template:Harvtxt used intermediate Jacobians to show that non-singular cubic threefolds are not rational, even though they are unirational.

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.

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  • Many property agents need to declare for the PIC grant in Singapore. However, not all of them know find out how to do the correct process for getting this PIC scheme from the IRAS. There are a number of steps that you need to do before your software can be approved.

    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.

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    Once you place down the one per cent choice price to carry down a non-public property, it's important to accept its situation as it is whenever you move in – faulty air-con, choked rest room and all. Get round this by asking your agent to incorporate a ultimate inspection clause within the possibility-to-buy letter. HDB flat patrons routinely take pleasure in this security net. "There's a ultimate inspection of the property two days before the completion of all HDB transactions. If the air-con is defective, you can request the seller to repair it," says Kelvin.

    15.6.1 As the agent is an intermediary, generally, as soon as the principal and third party are introduced right into a contractual relationship, the agent drops out of the image, subject to any problems with remuneration or indemnification that he could have against the principal, and extra exceptionally, against the third occasion. Generally, agents are entitled to be indemnified for all liabilities reasonably incurred within the execution of the brokers´ authority.

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  • Many property agents need to declare for the PIC grant in Singapore. However, not all of them know find out how to do the correct process for getting this PIC scheme from the IRAS. There are a number of steps that you need to do before your software can be approved.

    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.

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    Once you place down the one per cent choice price to carry down a non-public property, it's important to accept its situation as it is whenever you move in – faulty air-con, choked rest room and all. Get round this by asking your agent to incorporate a ultimate inspection clause within the possibility-to-buy letter. HDB flat patrons routinely take pleasure in this security net. "There's a ultimate inspection of the property two days before the completion of all HDB transactions. If the air-con is defective, you can request the seller to repair it," says Kelvin.

    15.6.1 As the agent is an intermediary, generally, as soon as the principal and third party are introduced right into a contractual relationship, the agent drops out of the image, subject to any problems with remuneration or indemnification that he could have against the principal, and extra exceptionally, against the third occasion. Generally, agents are entitled to be indemnified for all liabilities reasonably incurred within the execution of the brokers´ authority.

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  • Many property agents need to declare for the PIC grant in Singapore. However, not all of them know find out how to do the correct process for getting this PIC scheme from the IRAS. There are a number of steps that you need to do before your software can be approved.

    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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    Once you place down the one per cent choice price to carry down a non-public property, it's important to accept its situation as it is whenever you move in – faulty air-con, choked rest room and all. Get round this by asking your agent to incorporate a ultimate inspection clause within the possibility-to-buy letter. HDB flat patrons routinely take pleasure in this security net. "There's a ultimate inspection of the property two days before the completion of all HDB transactions. If the air-con is defective, you can request the seller to repair it," says Kelvin.

    15.6.1 As the agent is an intermediary, generally, as soon as the principal and third party are introduced right into a contractual relationship, the agent drops out of the image, subject to any problems with remuneration or indemnification that he could have against the principal, and extra exceptionally, against the third occasion. Generally, agents are entitled to be indemnified for all liabilities reasonably incurred within the execution of the brokers´ authority.

    To achieve the very best outcomes, you must be always updated on market situations, including past transaction information and reliable projections. You could review and examine comparable homes that are currently available in the market, especially these which have been sold or not bought up to now six months. You'll be able to see a pattern of such report by clicking here It's essential to defend yourself in opposition to unscrupulous patrons. They are often very skilled in using highly unethical and manipulative techniques to try and lure you into a lure. That you must also protect your self, your loved ones, and personal belongings as you'll be serving many strangers in your home. Sign a listing itemizing of all of the objects provided by the proprietor, together with their situation. HSR Prime Recruiter 2010