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In the [[mathematics|mathematical]] field of [[Riemannian geometry]], [[Mikhail Gromov (mathematician)|M. Gromov]]'s '''systolic inequality''' bounds the length of the shortest [[contractible space|non-contractible]] loop on a [[Riemannian manifold]] in terms of the volume of the manifold. Gromov's systolic inequality was proved in 1983;<ref>see {{harvtxt|Gromov|1983}}</ref> it can be viewed as a generalisation, albeit non-optimal, of [[Loewner's torus inequality]] and [[Pu's inequality|Pu's inequality for the real projective plane]].
 
Technically, let ''M'' be an [[essential manifold|essential]] Riemannian manifold of dimension ''n''; denote by sys''&pi;''<sub>1</sub>(''M'') the homotopy 1-systole of ''M'', that is, the least length of a non-contractible loop on ''M''. Then Gromov's inequality takes the form
 
:<math> \left(\operatorname{sys\pi}_1(M)\right)^n \leq C_n \operatorname{vol}(M),</math>
 
where ''C''<sub>''n''</sub> is a universal constant only depending on the dimension of ''M''.
 
==Essential manifolds==
{{main|essential manifold}}
 
A closed manifold is called ''essential'' if its [[fundamental class]] defines a nonzero element in the [[homology (mathematics)|homology]] of its [[fundamental group]], or more precisely in the homology of the corresponding [[Eilenberg–MacLane space]].  Here the fundamental class is taken in homology with integer coefficients if the manifold is orientable, and in coefficients modulo 2, otherwise.
 
Examples of essential manifolds include [[aspherical manifold]]s, [[real projective space]]s, and [[lens space]]s.
 
==Proofs of Gromov's inequality==
 
Gromov's original 1983 proof is about 35 pages long. It relies on a number of techniques and inequalities of global Riemannian geometry.  The starting point of the proof is the imbedding of X into the Banach space of Borel functions on X, equipped with the sup norm.  The imbedding is defined by mapping a point ''p'' of ''X'', to the real function on ''X'' given by the distance from the point ''p''. The proof utilizes the [[coarea formula|coarea inequality]], the [[isoperimetry|isoperimetric inequality]], the cone inequality, and the deformation theorem of [[Herbert Federer]].
 
==Filling invariants and recent work==
 
One of the key ideas of the proof is the introduction of filling invariants, namely the [[filling radius]] and the filling volume of ''X''. Namely, Gromov proved a sharp inequality relating the systole and the filling radius,
 
:<math>\mathrm{sys\pi}_1 \leq 6\; \mathrm{FillRad}(X),</math>
 
valid for all essential manifolds ''X''; as well as an inequality
 
:<math>\mathrm{FillRad}(X) \leq C_n \mathrm{vol}_n{}^{\tfrac{1}{n}}(X),</math>
 
valid for all closed manifolds ''X''.
 
It was shown by {{harvtxt|Brunnbauer|2008}} that the filling invariants, unlike the systolic invariants, are independent of the topology of the manifold in a suitable sense.
 
{{harvtxt|Guth|2011}} and {{harvtxt|Ambrosio|2011}} developed approaches to the proof of Gromov's systolic inequality for essential manifolds.
 
==Inequalities for surfaces and polyhedra==
 
Stronger results are available for surfaces, where the asymptotics when the genus tends to infinity are by now well understood, see [[systoles of surfaces]].  A uniform inequality for arbitrary 2-complexes with non-free fundamental groups is available, whose proof relies on the [[Grushko theorem|Grushko decomposition theorem]].
 
==Notes==
{{Reflist}}
 
==See also==
*[[Filling area conjecture]]
*[[Gromov's inequality]]
*[[Gromov's inequality for complex projective space]]
*[[Loewner's torus inequality]]
*[[Pu's inequality]]
*[[Systolic geometry]]
 
==References==
*{{citation
| mr = 2803853
| last1 = Ambrosio | first1 = Luigi
| author1-link = Luigi Ambrosio
| last2 = Katz | first2 = Mikhail
| author2-link = Mikhail Katz
| arxiv = 1004.1374
| doi = 10.4171/CMH/234
| issue = 3
| journal = [[Commentarii Mathematici Helvetici]]
| pages = 557–592
| title = Flat currents modulo p  in metric spaces and filling radius inequalities
| volume = 86
| year = 2011}}.
*{{Citation|last=Brunnbauer|first=M.|title=Filling inequalities do not depend on topology|volume=624|year=2008|pages=217&ndash;231|journal=J. Reine Angew. Math.}}
*{{Citation|last=Gromov|first=M.|title=Filling Riemannian manifolds|journal=J. Diff. Geom.|volume=18|year=1983|pages=1&ndash;147|mr=0697984|id={{Euclid|euclid.jdg/1214509283}}|zbl=0515.53037}}
*{{Citation|mr=2753599|last=Guth|first=Larry
|author1-link= Larry Guth
|title=Volumes of balls in large Riemannian manifolds|journal=Ann. Of Math. (2)|volume=173|year=2011|issue=1|pages=51&ndash;76|doi=10.4007/annals.2011.173.1.2}}
*{{Citation | last1=Katz | first1=Mikhail G. | title=Systolic geometry and topology|pages=19 | publisher=[[American Mathematical Society]] | location=Providence, R.I. | series=Mathematical Surveys and Monographs | isbn=978-0-8218-4177-8 | year=2007 | volume=137}}
 
{{Systolic geometry navbox}}
 
[[Category:Geometric inequalities]]
[[Category:Riemannian geometry]]
[[Category:Systolic geometry]]

Revision as of 03:48, 11 November 2013

In the mathematical field of Riemannian geometry, M. Gromov's systolic inequality bounds the length of the shortest non-contractible loop on a Riemannian manifold in terms of the volume of the manifold. Gromov's systolic inequality was proved in 1983;[1] it can be viewed as a generalisation, albeit non-optimal, of Loewner's torus inequality and Pu's inequality for the real projective plane.

Technically, let M be an essential Riemannian manifold of dimension n; denote by sysπ1(M) the homotopy 1-systole of M, that is, the least length of a non-contractible loop on M. Then Gromov's inequality takes the form

(sysπ1(M))nCnvol(M),

where Cn is a universal constant only depending on the dimension of M.

Essential manifolds

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A closed manifold is called essential if its fundamental class defines a nonzero element in the homology of its fundamental group, or more precisely in the homology of the corresponding Eilenberg–MacLane space. Here the fundamental class is taken in homology with integer coefficients if the manifold is orientable, and in coefficients modulo 2, otherwise.

Examples of essential manifolds include aspherical manifolds, real projective spaces, and lens spaces.

Proofs of Gromov's inequality

Gromov's original 1983 proof is about 35 pages long. It relies on a number of techniques and inequalities of global Riemannian geometry. The starting point of the proof is the imbedding of X into the Banach space of Borel functions on X, equipped with the sup norm. The imbedding is defined by mapping a point p of X, to the real function on X given by the distance from the point p. The proof utilizes the coarea inequality, the isoperimetric inequality, the cone inequality, and the deformation theorem of Herbert Federer.

Filling invariants and recent work

One of the key ideas of the proof is the introduction of filling invariants, namely the filling radius and the filling volume of X. Namely, Gromov proved a sharp inequality relating the systole and the filling radius,

sysπ16FillRad(X),

valid for all essential manifolds X; as well as an inequality

FillRad(X)Cnvoln1n(X),

valid for all closed manifolds X.

It was shown by Template:Harvtxt that the filling invariants, unlike the systolic invariants, are independent of the topology of the manifold in a suitable sense.

Template:Harvtxt and Template:Harvtxt developed approaches to the proof of Gromov's systolic inequality for essential manifolds.

Inequalities for surfaces and polyhedra

Stronger results are available for surfaces, where the asymptotics when the genus tends to infinity are by now well understood, see systoles of surfaces. A uniform inequality for arbitrary 2-complexes with non-free fundamental groups is available, whose proof relies on the Grushko decomposition theorem.

Notes

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See also

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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    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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    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.

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    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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