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In [[mathematics]], the '''Alexander polynomial''' is a [[knot invariant]] which assigns a [[polynomial]] with integer coefficients to each knot type.  [[James Waddell Alexander II]] discovered this, the first [[knot polynomial]], in 1923.  In 1969, [[John Horton Conway|John Conway]] showed a version of this polynomial, now called the '''Alexander&ndash;Conway polynomial''', could be computed using a [[skein relation]], although its significance was not realized until the discovery of the [[Jones polynomial]] in 1984.  Soon after Conway's reworking of the Alexander polynomial, it was realized that a similar skein relation was exhibited in Alexander's paper on his polynomial.<ref>Alexander describes his skein relation toward the end of his paper under the heading "miscellaneous theorems", which is possibly why it got lost.  [[Joan Birman]] mentions in her paper ''New points of view in knot theory'' (Bull. Amer. Math. Soc. (N.S.) 28 (1993), no. 2, 253&ndash;287) that Mark Kidwell brought her attention to Alexander's relation in 1970.</ref>


==Definition==
Let ''K'' be a knot in the [[3-sphere]].  Let ''X'' be the infinite [[covering space|cyclic cover]] of the [[knot complement]] of ''K''.  This covering can be obtained by cutting the knot complement along a [[Seifert surface]] of ''K'' and gluing together infinitely many copies of the resulting manifold with boundary in a cyclic manner.  There is a covering transformation ''t'' acting on ''X''.  Consider the first homology (with integer coefficients) of ''X'', denoted <math>H_1(X)</math>.  The transformation ''t'' acts on the homology and so we can consider <math>H_1(X)</math> a [[module (mathematics)|module]] over <math>\mathbb{Z}[t, t^{-1}]</math>.  This is called the '''Alexander invariant''' or '''Alexander module'''. 


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The module is finitely presentable; a [[presentation matrix]] for this module is called the '''Alexander matrix'''.  If the number of generators, ''r'', is less than or equal to the number of relations, ''s'', then we consider the ideal generated by all ''r'' by ''r'' minors of the matrix; this is the zero'th [[Fitting ideal]] or '''Alexander ideal''' and does not depend on choice of presentation matrix. If ''r > s'', set the ideal equal to 0. If the Alexander ideal is [[principal ideal|principal]], take a generator; this is called an Alexander polynomial of the knot.  Since this is only unique up to multiplication by the Laurent monomial <math>\pm t^n</math>, one often fixes a particular unique form.  Alexander's choice of normalization is to make the polynomial have a positive [[constant term]].
 
Alexander proved that the Alexander ideal is nonzero and always principal.  Thus an Alexander polynomial always exists, and is clearly a knot invariant, denoted <math>\Delta_K(t)</math>.
 
== Computing the polynomial ==
The following procedure for computing the Alexander polynomial was given by J. W. Alexander in his paper.
 
Take an [[oriented]] diagram  of the knot with ''n'' crossings; there are ''n''&nbsp;+&nbsp;2 regions of the knot diagram. To work out the Alexander polynomial, first one must create an [[incidence matrix]] of size (''n'', ''n''&nbsp;+&nbsp;2).  The ''n'' rows correspond to the ''n'' crossings, and the ''n''&nbsp;+&nbsp;2 columns to the regions. The values for the matrix entries are either 0, 1, −1, ''t'', −''t''.
 
Consider the entry corresponding to a particular region and crossing. If the region is not adjacent to the crossing, the entry is 0. If the region is adjacent to the crossing, the entry depends on its location. The following table gives the entry, determined by the location of the region at the crossing from the perspective of the incoming undercrossing line.
 
: on the left before undercrossing: −''t''
: on the right before undercrossing: 1
: on the left after undercrossing: ''t''
: on the right after undercrossing: −1
 
Remove two columns corresponding to adjacent regions from the matrix, and work out the determinant of the new ''n'' by ''n'' matrix.  Depending on the columns removed, the answer will differ by multiplication by <math>\pm t^n</math>.  To resolve this ambiguity, divide out the largest possible power of ''t'' and multiply by &minus;1 if necessary, so that the constant term is positive.  This gives the Alexander polynomial.
 
The Alexander polynomial can also be computed from the [[Seifert matrix]].
 
After the work of Alexander R. Fox considered a copresentation of the knot group <math>\pi_1(S^3\backslash K)</math>, and introduced non-commutative differential calculus {{harvtxt|Fox|1961}}, which also permits to compute <math>\Delta_K(t)</math>. Detailed exposition of this approach about higher Alexander polynomials can be found in the book {{harvtxt|Crowell|Fox|1963}}.
 
==Basic properties of the polynomial==
 
The Alexander polynomial is symmetric: <math>\Delta_K(t^{-1}) = \Delta_K(t)</math> for all knots K.
 
: From the point of view of the definition, this is an expression of the [[Poincaré duality|Poincaré Duality isomorphism]] <math> \overline{H_1 X} \simeq \mathrm{Hom}_{\Bbb Z[t,t^{-1}]}(H_1 X, G) </math> where <math>G</math> is the quotient of the field of fractions of <math>\Bbb Z[t,t^{-1}]</math> by <math>\Bbb Z[t,t^{-1}]</math>, considered as a <math>\Bbb Z[t,t^{-1}]</math>-module, and where <math>\overline{H_1 X}</math> is the conjugate <math>\Bbb Z[t,t^{-1}]</math>-module to <math>H_1 X</math> ie: as an abelian group it is identical to <math>H_1 X</math> but the covering transformation <math>t</math> acts by <math>t^{-1}</math>.
 
and it evaluates to a unit on 1: <math>\Delta_K(1)=\pm 1</math>.
 
: From the point of view of the definition, this is an expression of the fact that the knot complement is a homology circle, generated by the covering transformation <math>t</math>.  More generally if <math>M</math> is a 3-manifold such that <math>rank(H_1 M) = 1</math> it has an Alexander polynomial <math>\Delta_M(t)</math> defined as the order ideal of its infinite-cyclic covering space. In this case <math>\Delta_M(1)</math> is, up to sign, equal to the order of the torsion subgroup of <math>H_1 M</math>.
 
It is known that every integral Laurent polynomial which is both symmetric and evaluates to a unit at 1 is the Alexander polynomial of a knot (Kawauchi 1996).
 
==Geometric significance of the polynomial==
 
Since the Alexander ideal is principal, <math>\Delta_K(t)=1</math> [[if and only if]] the commutator subgroup of the knot group is [[perfect group|perfect]] (i.e. equal to its own [[commutator subgroup]]).
 
For a [[topologically slice]] knot, the Alexander polynomial satisfies the Fox&ndash;Milnor condition <math>\Delta_K(t) = f(t)f(t^{-1})</math> where <math>f(t)</math> is some other integral Laurent polynomial.
 
Twice the [[Seifert surface|knot genus]] is bounded below by the degree of the Alexander polynomial.
 
Michael Freedman proved that a knot in the 3-sphere is [[topologically slice]]; i.e., bounds a "locally-flat" topological disc in the 4-ball, if the Alexander polynomial of the knot is trivial (Freedman and Quinn, 1990).
 
{{harvtxt|Kauffman|1983}} describes the first construction of the Alexander polynomial via state sums derived from physical models. A survey of these topic and other connections with physics are given in {{harvtxt|Kauffman|2001}}.
 
There are other relations with surfaces and smooth 4-dimensional topology. For example, under certain assumptions, there is a way of modifying a smooth [[4-manifold]] by performing a [[surgery theory|surgery]] that consists of removing a neighborhood of a two-dimensional torus and replacing it with a knot complement crossed with ''S''<sup>1</sup>. The result is a smooth 4-manifold homeomorphic to the original, though now the [[Seiberg&ndash;Witten invariant]] has been modified by multiplication with the Alexander polynomial of the knot.<ref>[http://arxiv.org/abs/dg-ga/9612014 Fintushel and Stern (1997) &ndash; Knots, links, and 4-manifolds]</ref>
 
Knots with symmetries are known to have restricted Alexander polynomials. See the symmetry section in (Kawauchi 1996). Although, the Alexander polynomial can fail to detect some symmetries, such as strong invertibility.
 
If the [[knot complement]] fibers over the circle, then the Alexander polynomial of the knot is known to be ''monic'' (the coefficients of the highest and lowest order terms are equal to <math>\pm 1</math>). In fact, if <math>S \to C_K \to S^1</math> is a fiber bundle where <math>C_K</math> is the knot complement, let <math>g : S \to S</math> represent the [[monodromy]], then <math>\Delta_K(t) = Det(tI-g_*)</math> where <math>g_* : H_1 S \to H_1 S</math> is the induced map on homology.
 
==Relations to satellite operations==
 
If a knot <math>K</math> is a [[satellite knot]] with companion <math>K'</math> i.e.: there exists an embedding <math>f : S^1 \times D^2 \to S^3</math> such that <math>K=f(K')</math> where <math>S^1 \times D^2 \subset S^3</math> is an unknotted solid torus, then <math>\Delta_K(t) = \Delta_{f(S^1 \times \{0\})}(t^a) \Delta_{K'}(t)</math>. Where <math>a \in \mathbb Z</math> is the integer that represents <math>K' \subset S^1 \times D^2</math> in <math>H_1(S^1\times D^2) = \mathbb Z</math>.
 
Examples: For a connect-sum <math>\Delta_{K_1 \# K_2}(t) = \Delta_{K_1}(t) \Delta_{K_2}(t)</math>. If <math>K</math> is an untwisted Whitehead double, then <math>\Delta_K(t)=\pm 1</math>.
 
==Alexander&ndash;Conway polynomial==
Alexander proved the Alexander polynomial satisfies a skein relation.  [[John Horton Conway|John Conway]] later rediscovered this in a different form and showed that the skein relation together with a choice of value on the unknot was enough to determine the polynomial. Conway's version is a polynomial in ''z'' with integer coefficients, denoted <math>\nabla(z)</math> and called the '''Alexander&ndash;Conway polynomial''' (also known as '''Conway polynomial''' or '''Conway&ndash;Alexander polynomial'''). 
 
Suppose we are given an oriented link diagram, where <math>L_+, L_-, L_0</math> are link diagrams resulting from crossing and smoothing changes on a local region of a specified crossing of the diagram, as indicated in the figure.  [[Image:Skein (HOMFLY).svg|200px|center]]
 
Here are Conway's skein relations:
 
* <math>\nabla(O) = 1</math> (where O is any diagram of the unknot)
* <math>\nabla(L_+) - \nabla(L_-) = z \nabla(L_0)</math>
 
The relationship to the standard Alexander polynomial is given by <math>\Delta_L(t^2) = \nabla_L(t - t^{-1})</math>. Here <math>\Delta_L</math> must be properly normalized (by multiplication of <math>\pm t^{n/2}</math>) to satisfy the skein relation <math>\Delta(L_+) - \Delta(L_-) = (t^{1/2} - t^{-1/2}) \Delta(L_0)</math>. Note that this relation gives a Laurent polynomial in ''t<sup>1/2</sup>''.
 
See [[knot theory]] for an example computing the Conway polynomial of the trefoil.
 
== Relation to Khovanov homology ==
 
In {{harvtxt|Ozsvath|Szabo|2004}} and {{harvtxt|Rasmussen|2003}} the Alexander polynomial is presented as [[Euler characteristic]] of a complex, whose homology are isotopy invariants of the considered knot <math>K</math>, therefore [[Floer homology]] theory is a categorification of the Alexander polynomial. For detail, see [[Khovanov homology]] {{harvtxt|Khovanov|2003}}.
 
==Notes==
{{Reflist}}
 
==References==
*{{Cite journal |first=J. W. |last=Alexander |title=Topological invariants of knots and links |journal=[[Transactions of the American Mathematical Society|Trans. Amer. Math. Soc.]] |volume=30 |year=1928 |issue=2 |pages=275–306 |doi=10.2307/1989123 }}
*{{Cite book |first1=R. |last1=Crowell |first2=R. |last2=Fox |title=Introduction to Knot Theory |publisher=Ginn and Co. after 1977 Springer Verlag |year=1963 |ref=harv }}
*{{Cite book |first=Colin C. |last=Adams |title=The Knot Book: An elementary introduction to the mathematical theory of knots |edition=Revised reprint of the 1994 original |publisher=American Mathematical Society |location=Providence, RI |year=2004 |isbn=0-8218-3678-1 }} (accessible introduction utilizing a skein relation approach)
*{{Cite journal |first=R. |last=Fox |title=A quick trip through knot theory, In Topology of ThreeManifold |edition=Proceedings of 1961 Topology Institute at Univ. of Georgia, edited by M.K.Fort |publisher=Prentice-Hall |location=Englewood Cliffs. N. J. |year=1961 |page=120–167 |ref=harv }}
*{{Cite book |authorlink=Michael H. Freedman |first=Michael H. |last=Freedman |authorlink2=Frank Quinn (mathematician) |first2=Frank |last2=Quinn |title=Topology of 4-manifolds |series=Princeton Mathematical Series |volume=39 |publisher=Princeton University Press |location=Princeton, NJ |year=1990 |isbn=0-691-08577-3 }}
*{{Cite journal |first=Louis |last=Kauffman |title=Formal Knot Theory |publisher=Princeton University press |year=1983 |ref=harv }}
*{{Cite book |first=Louis |last=Kauffman |title=Knots and Physics |publisher=World Scientific Publishing Companey |year=2001 |ref=harv }}
*{{Cite book |first=Akio |last=Kawauchi |title=A Survey of Knot Theory |publisher=Birkhauser |year=1996 |isbn= }} (covers several different approaches, explains relations between different versions of the Alexander polynomial)
*{{Cite journal |first=M. |last=Khovanov |title=Link homology and ategorification | series=Proceedings of the ICM-2006 |year=2006 |ref=harv |arxiv=math/0605339.pdf }}
*{{Cite journal |first1=Peter |last1=Ozsvath |first2=Zoltan |last2=Szabo |title=Holomorphic disks and knot invariants |series=Adv. Math. |volume=186 (1) |year=2004 |page=58–116 |ref=harv |bibcode=2002math......9056O |arxiv=math/0209056 |quote=class=math.GT |issue=1 |journal=Adv. Math., no., 58--6}}
*{{Cite journal |first=J. |last=Rasmussen |title=Floer homology and knot complements | series=PhD thesis Harvard University |year=2003 |ref=harv |arxiv=math/0306378.pdf |bibcode=2003math......6378R |pages=6378 }}
*{{Cite book |first=Dale |last=Rolfsen |title=Knots and Links |edition=2nd |location=Berkeley, CA |publisher=Publish or Perish |year=1990 |isbn=0-914098-16-0 }} (explains classical approach using the Alexander invariant; knot and link table with Alexander polynomials)
 
==External links==
* {{springer|title=Alexander invariants|id=p/a011300}}
* {{Knot Atlas|Main_Page|Main Page|The_Alexander-Conway_Polynomial|The Alexander-Conway Polynomial}} &ndash; knot and link tables with computed Alexander and Conway polynomials
 
{{Knot theory}}
 
[[Category:Knot theory]]
[[Category:Diagram algebras]]
[[Category:Polynomials]]

Latest revision as of 22:50, 18 September 2013

In mathematics, the Alexander polynomial is a knot invariant which assigns a polynomial with integer coefficients to each knot type. James Waddell Alexander II discovered this, the first knot polynomial, in 1923. In 1969, John Conway showed a version of this polynomial, now called the Alexander–Conway polynomial, could be computed using a skein relation, although its significance was not realized until the discovery of the Jones polynomial in 1984. Soon after Conway's reworking of the Alexander polynomial, it was realized that a similar skein relation was exhibited in Alexander's paper on his polynomial.[1]

Definition

Let K be a knot in the 3-sphere. Let X be the infinite cyclic cover of the knot complement of K. This covering can be obtained by cutting the knot complement along a Seifert surface of K and gluing together infinitely many copies of the resulting manifold with boundary in a cyclic manner. There is a covering transformation t acting on X. Consider the first homology (with integer coefficients) of X, denoted H1(X). The transformation t acts on the homology and so we can consider H1(X) a module over [t,t1]. This is called the Alexander invariant or Alexander module.

The module is finitely presentable; a presentation matrix for this module is called the Alexander matrix. If the number of generators, r, is less than or equal to the number of relations, s, then we consider the ideal generated by all r by r minors of the matrix; this is the zero'th Fitting ideal or Alexander ideal and does not depend on choice of presentation matrix. If r > s, set the ideal equal to 0. If the Alexander ideal is principal, take a generator; this is called an Alexander polynomial of the knot. Since this is only unique up to multiplication by the Laurent monomial ±tn, one often fixes a particular unique form. Alexander's choice of normalization is to make the polynomial have a positive constant term.

Alexander proved that the Alexander ideal is nonzero and always principal. Thus an Alexander polynomial always exists, and is clearly a knot invariant, denoted ΔK(t).

Computing the polynomial

The following procedure for computing the Alexander polynomial was given by J. W. Alexander in his paper.

Take an oriented diagram of the knot with n crossings; there are n + 2 regions of the knot diagram. To work out the Alexander polynomial, first one must create an incidence matrix of size (n, n + 2). The n rows correspond to the n crossings, and the n + 2 columns to the regions. The values for the matrix entries are either 0, 1, −1, t, −t.

Consider the entry corresponding to a particular region and crossing. If the region is not adjacent to the crossing, the entry is 0. If the region is adjacent to the crossing, the entry depends on its location. The following table gives the entry, determined by the location of the region at the crossing from the perspective of the incoming undercrossing line.

on the left before undercrossing: −t
on the right before undercrossing: 1
on the left after undercrossing: t
on the right after undercrossing: −1

Remove two columns corresponding to adjacent regions from the matrix, and work out the determinant of the new n by n matrix. Depending on the columns removed, the answer will differ by multiplication by ±tn. To resolve this ambiguity, divide out the largest possible power of t and multiply by −1 if necessary, so that the constant term is positive. This gives the Alexander polynomial.

The Alexander polynomial can also be computed from the Seifert matrix.

After the work of Alexander R. Fox considered a copresentation of the knot group π1(S3K), and introduced non-commutative differential calculus Template:Harvtxt, which also permits to compute ΔK(t). Detailed exposition of this approach about higher Alexander polynomials can be found in the book Template:Harvtxt.

Basic properties of the polynomial

The Alexander polynomial is symmetric: ΔK(t1)=ΔK(t) for all knots K.

From the point of view of the definition, this is an expression of the Poincaré Duality isomorphism H1XHom[t,t1](H1X,G) where G is the quotient of the field of fractions of [t,t1] by [t,t1], considered as a [t,t1]-module, and where H1X is the conjugate [t,t1]-module to H1X ie: as an abelian group it is identical to H1X but the covering transformation t acts by t1.

and it evaluates to a unit on 1: ΔK(1)=±1.

From the point of view of the definition, this is an expression of the fact that the knot complement is a homology circle, generated by the covering transformation t. More generally if M is a 3-manifold such that rank(H1M)=1 it has an Alexander polynomial ΔM(t) defined as the order ideal of its infinite-cyclic covering space. In this case ΔM(1) is, up to sign, equal to the order of the torsion subgroup of H1M.

It is known that every integral Laurent polynomial which is both symmetric and evaluates to a unit at 1 is the Alexander polynomial of a knot (Kawauchi 1996).

Geometric significance of the polynomial

Since the Alexander ideal is principal, ΔK(t)=1 if and only if the commutator subgroup of the knot group is perfect (i.e. equal to its own commutator subgroup).

For a topologically slice knot, the Alexander polynomial satisfies the Fox–Milnor condition ΔK(t)=f(t)f(t1) where f(t) is some other integral Laurent polynomial.

Twice the knot genus is bounded below by the degree of the Alexander polynomial.

Michael Freedman proved that a knot in the 3-sphere is topologically slice; i.e., bounds a "locally-flat" topological disc in the 4-ball, if the Alexander polynomial of the knot is trivial (Freedman and Quinn, 1990).

Template:Harvtxt describes the first construction of the Alexander polynomial via state sums derived from physical models. A survey of these topic and other connections with physics are given in Template:Harvtxt.

There are other relations with surfaces and smooth 4-dimensional topology. For example, under certain assumptions, there is a way of modifying a smooth 4-manifold by performing a surgery that consists of removing a neighborhood of a two-dimensional torus and replacing it with a knot complement crossed with S1. The result is a smooth 4-manifold homeomorphic to the original, though now the Seiberg–Witten invariant has been modified by multiplication with the Alexander polynomial of the knot.[2]

Knots with symmetries are known to have restricted Alexander polynomials. See the symmetry section in (Kawauchi 1996). Although, the Alexander polynomial can fail to detect some symmetries, such as strong invertibility.

If the knot complement fibers over the circle, then the Alexander polynomial of the knot is known to be monic (the coefficients of the highest and lowest order terms are equal to ±1). In fact, if SCKS1 is a fiber bundle where CK is the knot complement, let g:SS represent the monodromy, then ΔK(t)=Det(tIg*) where g*:H1SH1S is the induced map on homology.

Relations to satellite operations

If a knot K is a satellite knot with companion K i.e.: there exists an embedding f:S1×D2S3 such that K=f(K) where S1×D2S3 is an unknotted solid torus, then ΔK(t)=Δf(S1×{0})(ta)ΔK(t). Where a is the integer that represents KS1×D2 in H1(S1×D2)=.

Examples: For a connect-sum ΔK1#K2(t)=ΔK1(t)ΔK2(t). If K is an untwisted Whitehead double, then ΔK(t)=±1.

Alexander–Conway polynomial

Alexander proved the Alexander polynomial satisfies a skein relation. John Conway later rediscovered this in a different form and showed that the skein relation together with a choice of value on the unknot was enough to determine the polynomial. Conway's version is a polynomial in z with integer coefficients, denoted (z) and called the Alexander–Conway polynomial (also known as Conway polynomial or Conway–Alexander polynomial).

Suppose we are given an oriented link diagram, where

L+,L,L0

are link diagrams resulting from crossing and smoothing changes on a local region of a specified crossing of the diagram, as indicated in the figure.

Here are Conway's skein relations:

The relationship to the standard Alexander polynomial is given by ΔL(t2)=L(tt1). Here ΔL must be properly normalized (by multiplication of ±tn/2) to satisfy the skein relation Δ(L+)Δ(L)=(t1/2t1/2)Δ(L0). Note that this relation gives a Laurent polynomial in t1/2.

See knot theory for an example computing the Conway polynomial of the trefoil.

Relation to Khovanov homology

In Template:Harvtxt and Template:Harvtxt the Alexander polynomial is presented as Euler characteristic of a complex, whose homology are isotopy invariants of the considered knot K, therefore Floer homology theory is a categorification of the Alexander polynomial. For detail, see Khovanov homology Template:Harvtxt.

Notes

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    There are various methods to go about discovering the precise property. Some local newspapers (together with the Straits Instances ) have categorised property sections and many local property brokers have websites. Now there are some specifics to consider when buying a 'new launch' rental. Intended use of the unit Every sale begins with 10 p.c low cost for finish of season sale; changes to 20 % discount storewide; follows by additional reduction of fiftyand ends with last discount of 70 % or extra. Typically there is even a warehouse sale or transferring out sale with huge mark-down of costs for stock clearance. Deborah Regulation from Expat Realtor shares her property market update, plus prime rental residences and houses at the moment available to lease Esparina EC @ Sengkang
  • 20 year-old Real Estate Agent Rusty from Saint-Paul, has hobbies and interests which includes monopoly, property developers in singapore and poker. Will soon undertake a contiki trip that may include going to the Lower Valley of the Omo.

    My blog: http://www.primaboinca.com/view_profile.php?userid=5889534
  • 20 year-old Real Estate Agent Rusty from Saint-Paul, has hobbies and interests which includes monopoly, property developers in singapore and poker. Will soon undertake a contiki trip that may include going to the Lower Valley of the Omo.

    My blog: http://www.primaboinca.com/view_profile.php?userid=5889534 (accessible introduction utilizing a skein relation approach)
  • One of the biggest reasons investing in a Singapore new launch is an effective things is as a result of it is doable to be lent massive quantities of money at very low interest rates that you should utilize to purchase it. Then, if property values continue to go up, then you'll get a really high return on funding (ROI). Simply make sure you purchase one of the higher properties, reminiscent of the ones at Fernvale the Riverbank or any Singapore landed property Get Earnings by means of Renting

    In its statement, the singapore property listing - website link, government claimed that the majority citizens buying their first residence won't be hurt by the new measures. Some concessions can even be prolonged to chose teams of consumers, similar to married couples with a minimum of one Singaporean partner who are purchasing their second property so long as they intend to promote their first residential property. Lower the LTV limit on housing loans granted by monetary establishments regulated by MAS from 70% to 60% for property purchasers who are individuals with a number of outstanding housing loans on the time of the brand new housing purchase. Singapore Property Measures - 30 August 2010 The most popular seek for the number of bedrooms in Singapore is 4, followed by 2 and three. Lush Acres EC @ Sengkang

    Discover out more about real estate funding in the area, together with info on international funding incentives and property possession. Many Singaporeans have been investing in property across the causeway in recent years, attracted by comparatively low prices. However, those who need to exit their investments quickly are likely to face significant challenges when trying to sell their property – and could finally be stuck with a property they can't sell. Career improvement programmes, in-house valuation, auctions and administrative help, venture advertising and marketing, skilled talks and traisning are continuously planned for the sales associates to help them obtain better outcomes for his or her shoppers while at Knight Frank Singapore. No change Present Rules

    Extending the tax exemption would help. The exemption, which may be as a lot as $2 million per family, covers individuals who negotiate a principal reduction on their existing mortgage, sell their house short (i.e., for lower than the excellent loans), or take part in a foreclosure course of. An extension of theexemption would seem like a common-sense means to assist stabilize the housing market, but the political turmoil around the fiscal-cliff negotiations means widespread sense could not win out. Home Minority Chief Nancy Pelosi (D-Calif.) believes that the mortgage relief provision will be on the table during the grand-cut price talks, in response to communications director Nadeam Elshami. Buying or promoting of blue mild bulbs is unlawful.

    A vendor's stamp duty has been launched on industrial property for the primary time, at rates ranging from 5 per cent to 15 per cent. The Authorities might be trying to reassure the market that they aren't in opposition to foreigners and PRs investing in Singapore's property market. They imposed these measures because of extenuating components available in the market." The sale of new dual-key EC models will even be restricted to multi-generational households only. The models have two separate entrances, permitting grandparents, for example, to dwell separately. The vendor's stamp obligation takes effect right this moment and applies to industrial property and plots which might be offered inside three years of the date of buy. JLL named Best Performing Property Brand for second year running

    The data offered is for normal info purposes only and isn't supposed to be personalised investment or monetary advice. Motley Fool Singapore contributor Stanley Lim would not personal shares in any corporations talked about. Singapore private home costs increased by 1.eight% within the fourth quarter of 2012, up from 0.6% within the earlier quarter. Resale prices of government-built HDB residences which are usually bought by Singaporeans, elevated by 2.5%, quarter on quarter, the quickest acquire in five quarters. And industrial property, prices are actually double the levels of three years ago. No withholding tax in the event you sell your property. All your local information regarding vital HDB policies, condominium launches, land growth, commercial property and more

    There are various methods to go about discovering the precise property. Some local newspapers (together with the Straits Instances ) have categorised property sections and many local property brokers have websites. Now there are some specifics to consider when buying a 'new launch' rental. Intended use of the unit Every sale begins with 10 p.c low cost for finish of season sale; changes to 20 % discount storewide; follows by additional reduction of fiftyand ends with last discount of 70 % or extra. Typically there is even a warehouse sale or transferring out sale with huge mark-down of costs for stock clearance. Deborah Regulation from Expat Realtor shares her property market update, plus prime rental residences and houses at the moment available to lease Esparina EC @ Sengkang
  • 20 year-old Real Estate Agent Rusty from Saint-Paul, has hobbies and interests which includes monopoly, property developers in singapore and poker. Will soon undertake a contiki trip that may include going to the Lower Valley of the Omo.

    My blog: http://www.primaboinca.com/view_profile.php?userid=5889534
  • One of the biggest reasons investing in a Singapore new launch is an effective things is as a result of it is doable to be lent massive quantities of money at very low interest rates that you should utilize to purchase it. Then, if property values continue to go up, then you'll get a really high return on funding (ROI). Simply make sure you purchase one of the higher properties, reminiscent of the ones at Fernvale the Riverbank or any Singapore landed property Get Earnings by means of Renting

    In its statement, the singapore property listing - website link, government claimed that the majority citizens buying their first residence won't be hurt by the new measures. Some concessions can even be prolonged to chose teams of consumers, similar to married couples with a minimum of one Singaporean partner who are purchasing their second property so long as they intend to promote their first residential property. Lower the LTV limit on housing loans granted by monetary establishments regulated by MAS from 70% to 60% for property purchasers who are individuals with a number of outstanding housing loans on the time of the brand new housing purchase. Singapore Property Measures - 30 August 2010 The most popular seek for the number of bedrooms in Singapore is 4, followed by 2 and three. Lush Acres EC @ Sengkang

    Discover out more about real estate funding in the area, together with info on international funding incentives and property possession. Many Singaporeans have been investing in property across the causeway in recent years, attracted by comparatively low prices. However, those who need to exit their investments quickly are likely to face significant challenges when trying to sell their property – and could finally be stuck with a property they can't sell. Career improvement programmes, in-house valuation, auctions and administrative help, venture advertising and marketing, skilled talks and traisning are continuously planned for the sales associates to help them obtain better outcomes for his or her shoppers while at Knight Frank Singapore. No change Present Rules

    Extending the tax exemption would help. The exemption, which may be as a lot as $2 million per family, covers individuals who negotiate a principal reduction on their existing mortgage, sell their house short (i.e., for lower than the excellent loans), or take part in a foreclosure course of. An extension of theexemption would seem like a common-sense means to assist stabilize the housing market, but the political turmoil around the fiscal-cliff negotiations means widespread sense could not win out. Home Minority Chief Nancy Pelosi (D-Calif.) believes that the mortgage relief provision will be on the table during the grand-cut price talks, in response to communications director Nadeam Elshami. Buying or promoting of blue mild bulbs is unlawful.

    A vendor's stamp duty has been launched on industrial property for the primary time, at rates ranging from 5 per cent to 15 per cent. The Authorities might be trying to reassure the market that they aren't in opposition to foreigners and PRs investing in Singapore's property market. They imposed these measures because of extenuating components available in the market." The sale of new dual-key EC models will even be restricted to multi-generational households only. The models have two separate entrances, permitting grandparents, for example, to dwell separately. The vendor's stamp obligation takes effect right this moment and applies to industrial property and plots which might be offered inside three years of the date of buy. JLL named Best Performing Property Brand for second year running

    The data offered is for normal info purposes only and isn't supposed to be personalised investment or monetary advice. Motley Fool Singapore contributor Stanley Lim would not personal shares in any corporations talked about. Singapore private home costs increased by 1.eight% within the fourth quarter of 2012, up from 0.6% within the earlier quarter. Resale prices of government-built HDB residences which are usually bought by Singaporeans, elevated by 2.5%, quarter on quarter, the quickest acquire in five quarters. And industrial property, prices are actually double the levels of three years ago. No withholding tax in the event you sell your property. All your local information regarding vital HDB policies, condominium launches, land growth, commercial property and more

    There are various methods to go about discovering the precise property. Some local newspapers (together with the Straits Instances ) have categorised property sections and many local property brokers have websites. Now there are some specifics to consider when buying a 'new launch' rental. Intended use of the unit Every sale begins with 10 p.c low cost for finish of season sale; changes to 20 % discount storewide; follows by additional reduction of fiftyand ends with last discount of 70 % or extra. Typically there is even a warehouse sale or transferring out sale with huge mark-down of costs for stock clearance. Deborah Regulation from Expat Realtor shares her property market update, plus prime rental residences and houses at the moment available to lease Esparina EC @ Sengkang
  • 20 year-old Real Estate Agent Rusty from Saint-Paul, has hobbies and interests which includes monopoly, property developers in singapore and poker. Will soon undertake a contiki trip that may include going to the Lower Valley of the Omo.

    My blog: http://www.primaboinca.com/view_profile.php?userid=5889534
  • 20 year-old Real Estate Agent Rusty from Saint-Paul, has hobbies and interests which includes monopoly, property developers in singapore and poker. Will soon undertake a contiki trip that may include going to the Lower Valley of the Omo.

    My blog: http://www.primaboinca.com/view_profile.php?userid=5889534 (covers several different approaches, explains relations between different versions of the Alexander polynomial)
  • One of the biggest reasons investing in a Singapore new launch is an effective things is as a result of it is doable to be lent massive quantities of money at very low interest rates that you should utilize to purchase it. Then, if property values continue to go up, then you'll get a really high return on funding (ROI). Simply make sure you purchase one of the higher properties, reminiscent of the ones at Fernvale the Riverbank or any Singapore landed property Get Earnings by means of Renting

    In its statement, the singapore property listing - website link, government claimed that the majority citizens buying their first residence won't be hurt by the new measures. Some concessions can even be prolonged to chose teams of consumers, similar to married couples with a minimum of one Singaporean partner who are purchasing their second property so long as they intend to promote their first residential property. Lower the LTV limit on housing loans granted by monetary establishments regulated by MAS from 70% to 60% for property purchasers who are individuals with a number of outstanding housing loans on the time of the brand new housing purchase. Singapore Property Measures - 30 August 2010 The most popular seek for the number of bedrooms in Singapore is 4, followed by 2 and three. Lush Acres EC @ Sengkang

    Discover out more about real estate funding in the area, together with info on international funding incentives and property possession. Many Singaporeans have been investing in property across the causeway in recent years, attracted by comparatively low prices. However, those who need to exit their investments quickly are likely to face significant challenges when trying to sell their property – and could finally be stuck with a property they can't sell. Career improvement programmes, in-house valuation, auctions and administrative help, venture advertising and marketing, skilled talks and traisning are continuously planned for the sales associates to help them obtain better outcomes for his or her shoppers while at Knight Frank Singapore. No change Present Rules

    Extending the tax exemption would help. The exemption, which may be as a lot as $2 million per family, covers individuals who negotiate a principal reduction on their existing mortgage, sell their house short (i.e., for lower than the excellent loans), or take part in a foreclosure course of. An extension of theexemption would seem like a common-sense means to assist stabilize the housing market, but the political turmoil around the fiscal-cliff negotiations means widespread sense could not win out. Home Minority Chief Nancy Pelosi (D-Calif.) believes that the mortgage relief provision will be on the table during the grand-cut price talks, in response to communications director Nadeam Elshami. Buying or promoting of blue mild bulbs is unlawful.

    A vendor's stamp duty has been launched on industrial property for the primary time, at rates ranging from 5 per cent to 15 per cent. The Authorities might be trying to reassure the market that they aren't in opposition to foreigners and PRs investing in Singapore's property market. They imposed these measures because of extenuating components available in the market." The sale of new dual-key EC models will even be restricted to multi-generational households only. The models have two separate entrances, permitting grandparents, for example, to dwell separately. The vendor's stamp obligation takes effect right this moment and applies to industrial property and plots which might be offered inside three years of the date of buy. JLL named Best Performing Property Brand for second year running

    The data offered is for normal info purposes only and isn't supposed to be personalised investment or monetary advice. Motley Fool Singapore contributor Stanley Lim would not personal shares in any corporations talked about. Singapore private home costs increased by 1.eight% within the fourth quarter of 2012, up from 0.6% within the earlier quarter. Resale prices of government-built HDB residences which are usually bought by Singaporeans, elevated by 2.5%, quarter on quarter, the quickest acquire in five quarters. And industrial property, prices are actually double the levels of three years ago. No withholding tax in the event you sell your property. All your local information regarding vital HDB policies, condominium launches, land growth, commercial property and more

    There are various methods to go about discovering the precise property. Some local newspapers (together with the Straits Instances ) have categorised property sections and many local property brokers have websites. Now there are some specifics to consider when buying a 'new launch' rental. Intended use of the unit Every sale begins with 10 p.c low cost for finish of season sale; changes to 20 % discount storewide; follows by additional reduction of fiftyand ends with last discount of 70 % or extra. Typically there is even a warehouse sale or transferring out sale with huge mark-down of costs for stock clearance. Deborah Regulation from Expat Realtor shares her property market update, plus prime rental residences and houses at the moment available to lease Esparina EC @ Sengkang
  • One of the biggest reasons investing in a Singapore new launch is an effective things is as a result of it is doable to be lent massive quantities of money at very low interest rates that you should utilize to purchase it. Then, if property values continue to go up, then you'll get a really high return on funding (ROI). Simply make sure you purchase one of the higher properties, reminiscent of the ones at Fernvale the Riverbank or any Singapore landed property Get Earnings by means of Renting

    In its statement, the singapore property listing - website link, government claimed that the majority citizens buying their first residence won't be hurt by the new measures. Some concessions can even be prolonged to chose teams of consumers, similar to married couples with a minimum of one Singaporean partner who are purchasing their second property so long as they intend to promote their first residential property. Lower the LTV limit on housing loans granted by monetary establishments regulated by MAS from 70% to 60% for property purchasers who are individuals with a number of outstanding housing loans on the time of the brand new housing purchase. Singapore Property Measures - 30 August 2010 The most popular seek for the number of bedrooms in Singapore is 4, followed by 2 and three. Lush Acres EC @ Sengkang

    Discover out more about real estate funding in the area, together with info on international funding incentives and property possession. Many Singaporeans have been investing in property across the causeway in recent years, attracted by comparatively low prices. However, those who need to exit their investments quickly are likely to face significant challenges when trying to sell their property – and could finally be stuck with a property they can't sell. Career improvement programmes, in-house valuation, auctions and administrative help, venture advertising and marketing, skilled talks and traisning are continuously planned for the sales associates to help them obtain better outcomes for his or her shoppers while at Knight Frank Singapore. No change Present Rules

    Extending the tax exemption would help. The exemption, which may be as a lot as $2 million per family, covers individuals who negotiate a principal reduction on their existing mortgage, sell their house short (i.e., for lower than the excellent loans), or take part in a foreclosure course of. An extension of theexemption would seem like a common-sense means to assist stabilize the housing market, but the political turmoil around the fiscal-cliff negotiations means widespread sense could not win out. Home Minority Chief Nancy Pelosi (D-Calif.) believes that the mortgage relief provision will be on the table during the grand-cut price talks, in response to communications director Nadeam Elshami. Buying or promoting of blue mild bulbs is unlawful.

    A vendor's stamp duty has been launched on industrial property for the primary time, at rates ranging from 5 per cent to 15 per cent. The Authorities might be trying to reassure the market that they aren't in opposition to foreigners and PRs investing in Singapore's property market. They imposed these measures because of extenuating components available in the market." The sale of new dual-key EC models will even be restricted to multi-generational households only. The models have two separate entrances, permitting grandparents, for example, to dwell separately. The vendor's stamp obligation takes effect right this moment and applies to industrial property and plots which might be offered inside three years of the date of buy. JLL named Best Performing Property Brand for second year running

    The data offered is for normal info purposes only and isn't supposed to be personalised investment or monetary advice. Motley Fool Singapore contributor Stanley Lim would not personal shares in any corporations talked about. Singapore private home costs increased by 1.eight% within the fourth quarter of 2012, up from 0.6% within the earlier quarter. Resale prices of government-built HDB residences which are usually bought by Singaporeans, elevated by 2.5%, quarter on quarter, the quickest acquire in five quarters. And industrial property, prices are actually double the levels of three years ago. No withholding tax in the event you sell your property. All your local information regarding vital HDB policies, condominium launches, land growth, commercial property and more

    There are various methods to go about discovering the precise property. Some local newspapers (together with the Straits Instances ) have categorised property sections and many local property brokers have websites. Now there are some specifics to consider when buying a 'new launch' rental. Intended use of the unit Every sale begins with 10 p.c low cost for finish of season sale; changes to 20 % discount storewide; follows by additional reduction of fiftyand ends with last discount of 70 % or extra. Typically there is even a warehouse sale or transferring out sale with huge mark-down of costs for stock clearance. Deborah Regulation from Expat Realtor shares her property market update, plus prime rental residences and houses at the moment available to lease Esparina EC @ Sengkang
  • One of the biggest reasons investing in a Singapore new launch is an effective things is as a result of it is doable to be lent massive quantities of money at very low interest rates that you should utilize to purchase it. Then, if property values continue to go up, then you'll get a really high return on funding (ROI). Simply make sure you purchase one of the higher properties, reminiscent of the ones at Fernvale the Riverbank or any Singapore landed property Get Earnings by means of Renting

    In its statement, the singapore property listing - website link, government claimed that the majority citizens buying their first residence won't be hurt by the new measures. Some concessions can even be prolonged to chose teams of consumers, similar to married couples with a minimum of one Singaporean partner who are purchasing their second property so long as they intend to promote their first residential property. Lower the LTV limit on housing loans granted by monetary establishments regulated by MAS from 70% to 60% for property purchasers who are individuals with a number of outstanding housing loans on the time of the brand new housing purchase. Singapore Property Measures - 30 August 2010 The most popular seek for the number of bedrooms in Singapore is 4, followed by 2 and three. Lush Acres EC @ Sengkang

    Discover out more about real estate funding in the area, together with info on international funding incentives and property possession. Many Singaporeans have been investing in property across the causeway in recent years, attracted by comparatively low prices. However, those who need to exit their investments quickly are likely to face significant challenges when trying to sell their property – and could finally be stuck with a property they can't sell. Career improvement programmes, in-house valuation, auctions and administrative help, venture advertising and marketing, skilled talks and traisning are continuously planned for the sales associates to help them obtain better outcomes for his or her shoppers while at Knight Frank Singapore. No change Present Rules

    Extending the tax exemption would help. The exemption, which may be as a lot as $2 million per family, covers individuals who negotiate a principal reduction on their existing mortgage, sell their house short (i.e., for lower than the excellent loans), or take part in a foreclosure course of. An extension of theexemption would seem like a common-sense means to assist stabilize the housing market, but the political turmoil around the fiscal-cliff negotiations means widespread sense could not win out. Home Minority Chief Nancy Pelosi (D-Calif.) believes that the mortgage relief provision will be on the table during the grand-cut price talks, in response to communications director Nadeam Elshami. Buying or promoting of blue mild bulbs is unlawful.

    A vendor's stamp duty has been launched on industrial property for the primary time, at rates ranging from 5 per cent to 15 per cent. The Authorities might be trying to reassure the market that they aren't in opposition to foreigners and PRs investing in Singapore's property market. They imposed these measures because of extenuating components available in the market." The sale of new dual-key EC models will even be restricted to multi-generational households only. The models have two separate entrances, permitting grandparents, for example, to dwell separately. The vendor's stamp obligation takes effect right this moment and applies to industrial property and plots which might be offered inside three years of the date of buy. JLL named Best Performing Property Brand for second year running

    The data offered is for normal info purposes only and isn't supposed to be personalised investment or monetary advice. Motley Fool Singapore contributor Stanley Lim would not personal shares in any corporations talked about. Singapore private home costs increased by 1.eight% within the fourth quarter of 2012, up from 0.6% within the earlier quarter. Resale prices of government-built HDB residences which are usually bought by Singaporeans, elevated by 2.5%, quarter on quarter, the quickest acquire in five quarters. And industrial property, prices are actually double the levels of three years ago. No withholding tax in the event you sell your property. All your local information regarding vital HDB policies, condominium launches, land growth, commercial property and more

    There are various methods to go about discovering the precise property. Some local newspapers (together with the Straits Instances ) have categorised property sections and many local property brokers have websites. Now there are some specifics to consider when buying a 'new launch' rental. Intended use of the unit Every sale begins with 10 p.c low cost for finish of season sale; changes to 20 % discount storewide; follows by additional reduction of fiftyand ends with last discount of 70 % or extra. Typically there is even a warehouse sale or transferring out sale with huge mark-down of costs for stock clearance. Deborah Regulation from Expat Realtor shares her property market update, plus prime rental residences and houses at the moment available to lease Esparina EC @ Sengkang
  • 20 year-old Real Estate Agent Rusty from Saint-Paul, has hobbies and interests which includes monopoly, property developers in singapore and poker. Will soon undertake a contiki trip that may include going to the Lower Valley of the Omo.

    My blog: http://www.primaboinca.com/view_profile.php?userid=5889534 (explains classical approach using the Alexander invariant; knot and link table with Alexander polynomials)

External links

  • Other Sports Official Kull from Drumheller, has hobbies such as telescopes, property developers in singapore and crocheting. Identified some interesting places having spent 4 months at Saloum Delta.

    my web-site http://himerka.com/
  • Template:Knot Atlas – knot and link tables with computed Alexander and Conway polynomials

Template:Knot theory

  1. Alexander describes his skein relation toward the end of his paper under the heading "miscellaneous theorems", which is possibly why it got lost. Joan Birman mentions in her paper New points of view in knot theory (Bull. Amer. Math. Soc. (N.S.) 28 (1993), no. 2, 253–287) that Mark Kidwell brought her attention to Alexander's relation in 1970.
  2. Fintushel and Stern (1997) – Knots, links, and 4-manifolds