9 17

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9 16.gif

9_16

9 18.gif

9_18

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9 17 Quick Notes


9 17 Further Notes and Views

Knot presentations

Planar diagram presentation X1425 X5,12,6,13 X3,11,4,10 X11,3,12,2 X7,14,8,15 X13,6,14,7 X15,18,16,1 X9,17,10,16 X17,9,18,8
Gauss code -1, 4, -3, 1, -2, 6, -5, 9, -8, 3, -4, 2, -6, 5, -7, 8, -9, 7
Dowker-Thistlethwaite code 4 10 12 14 16 2 6 18 8
Conway Notation [21312]

Three dimensional invariants

Symmetry type Reversible
Unknotting number 2
3-genus 3
Bridge index 2
Super bridge index [math]\displaystyle{ \{4,7\} }[/math]
Nakanishi index 1
Maximal Thurston-Bennequin number [-8][-3]
Hyperbolic Volume 9.47458
A-Polynomial See Data:9 17/A-polynomial

[edit Notes for 9 17's three dimensional invariants]

Four dimensional invariants

Smooth 4 genus [math]\displaystyle{ 1 }[/math]
Topological 4 genus [math]\displaystyle{ 1 }[/math]
Concordance genus [math]\displaystyle{ 3 }[/math]
Rasmussen s-Invariant -2

[edit Notes for 9 17's four dimensional invariants]

Polynomial invariants

Alexander polynomial [math]\displaystyle{ t^3-5 t^2+9 t-9+9 t^{-1} -5 t^{-2} + t^{-3} }[/math]
Conway polynomial [math]\displaystyle{ z^6+z^4-2 z^2+1 }[/math]
2nd Alexander ideal (db, data sources) [math]\displaystyle{ \{1\} }[/math]
Determinant and Signature { 39, -2 }
Jones polynomial [math]\displaystyle{ q^3-2 q^2+4 q-5+6 q^{-1} -7 q^{-2} +6 q^{-3} -4 q^{-4} +3 q^{-5} - q^{-6} }[/math]
HOMFLY-PT polynomial (db, data sources) [math]\displaystyle{ a^2 z^6-a^4 z^4+4 a^2 z^4-2 z^4-2 a^4 z^2+5 a^2 z^2+z^2 a^{-2} -6 z^2+2 a^2+2 a^{-2} -3 }[/math]
Kauffman polynomial (db, data sources) [math]\displaystyle{ a^2 z^8+z^8+3 a^3 z^7+5 a z^7+2 z^7 a^{-1} +4 a^4 z^6+4 a^2 z^6+z^6 a^{-2} +z^6+4 a^5 z^5-2 a^3 z^5-13 a z^5-7 z^5 a^{-1} +3 a^6 z^4-3 a^4 z^4-14 a^2 z^4-4 z^4 a^{-2} -12 z^4+a^7 z^3-3 a^5 z^3-4 a^3 z^3+6 a z^3+6 z^3 a^{-1} -2 a^6 z^2-a^4 z^2+9 a^2 z^2+5 z^2 a^{-2} +13 z^2+a^5 z+3 a^3 z+a z-z a^{-1} -2 a^2-2 a^{-2} -3 }[/math]
The A2 invariant [math]\displaystyle{ -q^{18}+q^{16}+q^{12}+2 q^{10}-q^8+q^6-2 q^4- q^{-2} + q^{-4} + q^{-8} + q^{-10} }[/math]
The G2 invariant [math]\displaystyle{ q^{100}-2 q^{98}+3 q^{96}-4 q^{94}+q^{92}-3 q^{88}+8 q^{86}-9 q^{84}+12 q^{82}-9 q^{80}+3 q^{78}+4 q^{76}-9 q^{74}+14 q^{72}-20 q^{70}+17 q^{68}-12 q^{66}+q^{64}+10 q^{62}-18 q^{60}+22 q^{58}-16 q^{56}+8 q^{54}+q^{52}-14 q^{50}+16 q^{48}-7 q^{46}-2 q^{44}+15 q^{42}-18 q^{40}+15 q^{38}+3 q^{36}-17 q^{34}+30 q^{32}-35 q^{30}+26 q^{28}-6 q^{26}-14 q^{24}+33 q^{22}-38 q^{20}+32 q^{18}-16 q^{16}-4 q^{14}+15 q^{12}-26 q^{10}+22 q^8-12 q^6-4 q^4+14 q^2-17+10 q^{-2} +3 q^{-4} -17 q^{-6} +23 q^{-8} -24 q^{-10} +11 q^{-12} +5 q^{-14} -21 q^{-16} +32 q^{-18} -27 q^{-20} +17 q^{-22} - q^{-24} -11 q^{-26} +19 q^{-28} -18 q^{-30} +14 q^{-32} -4 q^{-34} -2 q^{-36} +5 q^{-38} -5 q^{-40} +4 q^{-42} - q^{-44} + q^{-46} }[/math]

Vassiliev invariants

V2 and V3: (-2, 0)
V2,1 through V6,9:
V2,1 V3,1 V4,1 V4,2 V4,3 V5,1 V5,2 V5,3 V5,4 V6,1 V6,2 V6,3 V6,4 V6,5 V6,6 V6,7 V6,8 V6,9
[math]\displaystyle{ -8 }[/math] [math]\displaystyle{ 0 }[/math] [math]\displaystyle{ 32 }[/math] [math]\displaystyle{ \frac{116}{3} }[/math] [math]\displaystyle{ \frac{28}{3} }[/math] [math]\displaystyle{ 0 }[/math] [math]\displaystyle{ 32 }[/math] [math]\displaystyle{ 32 }[/math] [math]\displaystyle{ 0 }[/math] [math]\displaystyle{ -\frac{256}{3} }[/math] [math]\displaystyle{ 0 }[/math] [math]\displaystyle{ -\frac{928}{3} }[/math] [math]\displaystyle{ -\frac{224}{3} }[/math] [math]\displaystyle{ -\frac{4951}{15} }[/math] [math]\displaystyle{ -\frac{1796}{15} }[/math] [math]\displaystyle{ -\frac{2764}{45} }[/math] [math]\displaystyle{ \frac{7}{9} }[/math] [math]\displaystyle{ \frac{89}{15} }[/math]

V2,1 through V6,9 were provided by Petr Dunin-Barkowski <barkovs@itep.ru>, Andrey Smirnov <asmirnov@itep.ru>, and Alexei Sleptsov <sleptsov@itep.ru> and uploaded on October 2010 by User:Drorbn. Note that they are normalized differently than V2 and V3.

Khovanov Homology

The coefficients of the monomials [math]\displaystyle{ t^rq^j }[/math] are shown, along with their alternating sums [math]\displaystyle{ \chi }[/math] (fixed [math]\displaystyle{ j }[/math], alternation over [math]\displaystyle{ r }[/math]). The squares with yellow highlighting are those on the "critical diagonals", where [math]\displaystyle{ j-2r=s+1 }[/math] or [math]\displaystyle{ j-2r=s-1 }[/math], where [math]\displaystyle{ s= }[/math]-2 is the signature of 9 17. Nonzero entries off the critical diagonals (if any exist) are highlighted in red.   
\ r
  \  
j \
-5-4-3-2-101234χ
7         11
5        1 -1
3       31 2
1      21  -1
-1     43   1
-3    43    -1
-5   23     -1
-7  24      2
-9 12       -1
-11 2        2
-131         -1
Integral Khovanov Homology

(db, data source)

  
[math]\displaystyle{ \dim{\mathcal G}_{2r+i}\operatorname{KH}^r_{\mathbb Z} }[/math] [math]\displaystyle{ i=-3 }[/math] [math]\displaystyle{ i=-1 }[/math]
[math]\displaystyle{ r=-5 }[/math] [math]\displaystyle{ {\mathbb Z} }[/math]
[math]\displaystyle{ r=-4 }[/math] [math]\displaystyle{ {\mathbb Z}^{2}\oplus{\mathbb Z}_2 }[/math] [math]\displaystyle{ {\mathbb Z} }[/math]
[math]\displaystyle{ r=-3 }[/math] [math]\displaystyle{ {\mathbb Z}^{2}\oplus{\mathbb Z}_2^{2} }[/math] [math]\displaystyle{ {\mathbb Z}^{2} }[/math]
[math]\displaystyle{ r=-2 }[/math] [math]\displaystyle{ {\mathbb Z}^{4}\oplus{\mathbb Z}_2^{2} }[/math] [math]\displaystyle{ {\mathbb Z}^{2} }[/math]
[math]\displaystyle{ r=-1 }[/math] [math]\displaystyle{ {\mathbb Z}^{3}\oplus{\mathbb Z}_2^{4} }[/math] [math]\displaystyle{ {\mathbb Z}^{4} }[/math]
[math]\displaystyle{ r=0 }[/math] [math]\displaystyle{ {\mathbb Z}^{3}\oplus{\mathbb Z}_2^{3} }[/math] [math]\displaystyle{ {\mathbb Z}^{4} }[/math]
[math]\displaystyle{ r=1 }[/math] [math]\displaystyle{ {\mathbb Z}^{3}\oplus{\mathbb Z}_2^{2} }[/math] [math]\displaystyle{ {\mathbb Z}^{2} }[/math]
[math]\displaystyle{ r=2 }[/math] [math]\displaystyle{ {\mathbb Z}\oplus{\mathbb Z}_2^{3} }[/math] [math]\displaystyle{ {\mathbb Z}^{3} }[/math]
[math]\displaystyle{ r=3 }[/math] [math]\displaystyle{ {\mathbb Z}\oplus{\mathbb Z}_2 }[/math] [math]\displaystyle{ {\mathbb Z} }[/math]
[math]\displaystyle{ r=4 }[/math] [math]\displaystyle{ {\mathbb Z}_2 }[/math] [math]\displaystyle{ {\mathbb Z} }[/math]

Computer Talk

Much of the above data can be recomputed by Mathematica using the package KnotTheory`. See A Sample KnotTheory` Session.

[math]\displaystyle{ \textrm{Include}(\textrm{ColouredJonesM.mhtml}) }[/math]

In[1]:=    
<< KnotTheory`
Loading KnotTheory` (version of August 17, 2005, 14:44:34)...
In[2]:=
Crossings[Knot[9, 17]]
Out[2]=  
9
In[3]:=
PD[Knot[9, 17]]
Out[3]=  
PD[X[1, 4, 2, 5], X[5, 12, 6, 13], X[3, 11, 4, 10], X[11, 3, 12, 2], 
 X[7, 14, 8, 15], X[13, 6, 14, 7], X[15, 18, 16, 1], X[9, 17, 10, 16], 

X[17, 9, 18, 8]]
In[4]:=
GaussCode[Knot[9, 17]]
Out[4]=  
GaussCode[-1, 4, -3, 1, -2, 6, -5, 9, -8, 3, -4, 2, -6, 5, -7, 8, -9, 7]
In[5]:=
BR[Knot[9, 17]]
Out[5]=  
BR[4, {1, -2, 1, -2, -2, -2, 3, -2, 3}]
In[6]:=
alex = Alexander[Knot[9, 17]][t]
Out[6]=  
      -3   5    9            2    3

-9 + t - -- + - + 9 t - 5 t + t

           2   t
t
In[7]:=
Conway[Knot[9, 17]][z]
Out[7]=  
       2    4    6
1 - 2 z  + z  + z
In[8]:=
Select[AllKnots[], (alex === Alexander[#][t])&]
Out[8]=  
{Knot[9, 17]}
In[9]:=
{KnotDet[Knot[9, 17]], KnotSignature[Knot[9, 17]]}
Out[9]=  
{39, -2}
In[10]:=
J=Jones[Knot[9, 17]][q]
Out[10]=  
      -6   3    4    6    7    6            2    3

-5 - q + -- - -- + -- - -- + - + 4 q - 2 q + q

           5    4    3    2   q
q q q q
In[11]:=
Select[AllKnots[], (J === Jones[#][q] || (J /. q-> 1/q) === Jones[#][q])&]
Out[11]=  
{Knot[9, 17]}
In[12]:=
A2Invariant[Knot[9, 17]][q]
Out[12]=  
  -18    -16    -12    2     -8    -6   2     2    4    8    10

-q + q + q + --- - q + q - -- - q + q + q + q

                      10                4
q q
In[13]:=
Kauffman[Knot[9, 17]][a, z]
Out[13]=  
                                                      2
    2       2   z            3      5         2   5 z       2  2

-3 - -- - 2 a - - + a z + 3 a z + a z + 13 z + ---- + 9 a z -

     2          a                                   2
    a                                              a

                      3
  4  2      6  2   6 z         3      3  3      5  3    7  3       4
 a  z  - 2 a  z  + ---- + 6 a z  - 4 a  z  - 3 a  z  + a  z  - 12 z  - 
                    a

    4                                     5
 4 z        2  4      4  4      6  4   7 z          5      3  5
 ---- - 14 a  z  - 3 a  z  + 3 a  z  - ---- - 13 a z  - 2 a  z  + 
   2                                    a
  a

                 6                          7
    5  5    6   z       2  6      4  6   2 z         7      3  7
 4 a  z  + z  + -- + 4 a  z  + 4 a  z  + ---- + 5 a z  + 3 a  z  + 
                 2                        a
                a

  8    2  8
z + a z
In[14]:=
{Vassiliev[2][Knot[9, 17]], Vassiliev[3][Knot[9, 17]]}
Out[14]=  
{0, 0}
In[15]:=
Kh[Knot[9, 17]][q, t]
Out[15]=  
3    4     1        2        1       2       2       4       2

-- + - + ------ + ------ + ----- + ----- + ----- + ----- + ----- +

3   q    13  5    11  4    9  4    9  3    7  3    7  2    5  2

q q t q t q t q t q t q t q t

  3      4     3 t              2      3  2    3  3    5  3    7  4
 ---- + ---- + --- + 2 q t + q t  + 3 q  t  + q  t  + q  t  + q  t
  5      3      q
q t q t