K11a90

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K11a89

K11a91

1 Knot presentations
2 Three dimensional invariants
3 Four dimensional invariants
4 Polynomial invariants
5 "Similar" Knots (within the Atlas)
6 Vassiliev invariants
7 Khovanov Homology
8 Computer Talk
9 Modifying This Page

(Knotscape image)

See the full Hoste-Thistlethwaite Table of 11 Crossing Knots.

Visit K11a90's page at Knotilus!

Visit K11a90's page at the original Knot Atlas!

[edit K11a90 Quick Notes]

[edit K11a90 Further Notes and Views]

[edit] Knot presentations

Planar diagram presentation	X₄₂₅₁ X_10,3,11,4 X_12,6,13,5 X_16,7,17,8 X_18,9,19,10 X_2,11,3,12 X_22,14,1,13 X_20,16,21,15 X_8,17,9,18 X_6,19,7,20 X_14,22,15,21
Gauss code	1, -6, 2, -1, 3, -10, 4, -9, 5, -2, 6, -3, 7, -11, 8, -4, 9, -5, 10, -8, 11, -7
Dowker-Thistlethwaite code	4 10 12 16 18 2 22 20 8 6 14

A Braid Representative

A Morse Link Presentation

[edit] Three dimensional invariants

Symmetry type	Reversible
Unknotting number	2
3-genus	3
Bridge index	2
Super bridge index	Missing
Nakanishi index	Missing
Maximal Thurston-Bennequin number	Data:K11a90/ThurstonBennequinNumber
Hyperbolic Volume	12.5188
A-Polynomial	See Data:K11a90/A-polynomial

[edit Notes for K11a90's three dimensional invariants]

[edit] Four dimensional invariants

Smooth 4 genus	Missing
Topological 4 genus	Missing
Concordance genus	$3$
Rasmussen s-Invariant	2

[edit Notes for K11a90's four dimensional invariants]

[edit] Polynomial invariants

Alexander polynomial	$2 t 3 -10 t 2 + 20 t -23 + 20 t -1 -10 t -2 + 2 t -3$
Conway polynomial	$2 z 6 + 2 z 4 -2 z 2 + 1$
2nd Alexander ideal (db, data sources)	${1}$
Determinant and Signature	{ 87, -2 }
Jones polynomial	$- q 4 + 3 q 3 -5 q 2 + 9 q -11 + 13 q -1 -14 q -2 + 12 q -3 -9 q -4 + 6 q -5 -3 q -6 + q -7$
HOMFLY-PT polynomial (db, data sources)	$z 2 a 6 + a 6 -2 z 4 a 4 -4 z 2 a 4 - a 4 + z 6 a 2 + 2 z 4 a 2 - a 2 + z 6 + 3 z 4 + 3 z 2 + 2- z 4 a -2 -2 z 2 a -2$
Kauffman polynomial (db, data sources)	$a 2 z 10 + z 10 + 3 a 3 z 9 + 6 a z 9 + 3 z 9 a -1 + 5 a 4 z 8 + 6 a 2 z 8 + 3 z 8 a -2 + 4 z 8 + 6 a 5 z 7 + a 3 z 7 -16 a z 7 -10 z 7 a -1 + z 7 a -3 + 5 a 6 z 6 -5 a 4 z 6 -21 a 2 z 6 -13 z 6 a -2 -24 z 6 + 3 a 7 z 5 -9 a 5 z 5 -14 a 3 z 5 + 10 a z 5 + 8 z 5 a -1 -4 z 5 a -3 + a 8 z 4 -6 a 6 z 4 -2 a 4 z 4 + 18 a 2 z 4 + 17 z 4 a -2 + 30 z 4 -3 a 7 z 3 + 8 a 5 z 3 + 14 a 3 z 3 -3 a z 3 -2 z 3 a -1 + 4 z 3 a -3 - a 8 z 2 + 3 a 6 z 2 + 5 a 4 z 2 -7 a 2 z 2 -7 z 2 a -2 -15 z 2 -3 a 5 z -3 a 3 z + a z + z a -1 - a 6 - a 4 + a 2 + 2$
The A2 invariant	Data:K11a90/QuantumInvariant/A2/1,0
The G2 invariant	Data:K11a90/QuantumInvariant/G2/1,0

Further Quantum Invariants

K11a90 Quantum Invariants.

Computer Talk

The above data is available with the Mathematica package KnotTheory`, as shown in the (simulated) Mathematica session below. Your input (in red) is realistic; all else should have the same content as in a real mathematica session, but with different formatting. This Mathematica session is also available (albeit only for the knot 5_2) as the notebook PolynomialInvariantsSession.nb.

(The path below may be different on your system, and possibly also the KnotTheory` date)

In[1]:= AppendTo[$Path, "C:/drorbn/projects/KAtlas/"]; << KnotTheory`

Loading KnotTheory` version of August 31, 2006, 11:25:27.5625.

In[3]:= K = Knot["K11a90"];

In[4]:= Alexander[K][t]

KnotTheory::loading: Loading precomputed data in PD4Knots`.

Out[4]= $2 t 3 -10 t 2 + 20 t -23 + 20 t -1 -10 t -2 + 2 t -3$

In[5]:= Conway[K][z]

Out[5]= $2 z 6 + 2 z 4 -2 z 2 + 1$

In[6]:= Alexander[K, 2][t]

KnotTheory::credits: The program Alexander[K, r] to compute Alexander ideals was written by Jana Archibald at the University of Toronto in the summer of 2005.

Out[6]= ${1}$

In[7]:= {KnotDet[K], KnotSignature[K]}

Out[7]= { 87, -2 }

In[8]:= Jones[K][q]

KnotTheory::loading: Loading precomputed data in Jones4Knots`.

Out[8]= $- q 4 + 3 q 3 -5 q 2 + 9 q -11 + 13 q -1 -14 q -2 + 12 q -3 -9 q -4 + 6 q -5 -3 q -6 + q -7$

In[9]:= HOMFLYPT[K][a, z]

KnotTheory::credits: The HOMFLYPT program was written by Scott Morrison.

Out[9]= $z 2 a 6 + a 6 -2 z 4 a 4 -4 z 2 a 4 - a 4 + z 6 a 2 + 2 z 4 a 2 - a 2 + z 6 + 3 z 4 + 3 z 2 + 2- z 4 a -2 -2 z 2 a -2$

In[10]:= Kauffman[K][a, z]

KnotTheory::loading: Loading precomputed data in Kauffman4Knots`.

Out[10]= $a 2 z 10 + z 10 + 3 a 3 z 9 + 6 a z 9 + 3 z 9 a -1 + 5 a 4 z 8 + 6 a 2 z 8 + 3 z 8 a -2 + 4 z 8 + 6 a 5 z 7 + a 3 z 7 -16 a z 7 -10 z 7 a -1 + z 7 a -3 + 5 a 6 z 6 -5 a 4 z 6 -21 a 2 z 6 -13 z 6 a -2 -24 z 6 + 3 a 7 z 5 -9 a 5 z 5 -14 a 3 z 5 + 10 a z 5 + 8 z 5 a -1 -4 z 5 a -3 + a 8 z 4 -6 a 6 z 4 -2 a 4 z 4 + 18 a 2 z 4 + 17 z 4 a -2 + 30 z 4 -3 a 7 z 3 + 8 a 5 z 3 + 14 a 3 z 3 -3 a z 3 -2 z 3 a -1 + 4 z 3 a -3 - a 8 z 2 + 3 a 6 z 2 + 5 a 4 z 2 -7 a 2 z 2 -7 z 2 a -2 -15 z 2 -3 a 5 z -3 a 3 z + a z + z a -1 - a 6 - a 4 + a 2 + 2$

[edit] "Similar" Knots (within the Atlas)

Same Alexander/Conway Polynomial: {K11a118,}

Same Jones Polynomial (up to mirroring, $q\leftrightarrow q^{-1}$ ): {}

Computer Talk

The above data is available with the Mathematica package KnotTheory`. Your input (in red) is realistic; all else should have the same content as in a real mathematica session, but with different formatting.

(The path below may be different on your system, and possibly also the KnotTheory` date)

In[1]:= AppendTo[$Path, "C:/drorbn/projects/KAtlas/"]; << KnotTheory`

Loading KnotTheory` version of May 31, 2006, 14:15:20.091.

In[3]:= K = Knot["K11a90"];

In[4]:= {A = Alexander[K][t], J = Jones[K][q]}

KnotTheory::loading: Loading precomputed data in PD4Knots`.

KnotTheory::loading: Loading precomputed data in Jones4Knots`.

Out[4]= { $2 t 3 -10 t 2 + 20 t -23 + 20 t -1 -10 t -2 + 2 t -3$ , $- q 4 + 3 q 3 -5 q 2 + 9 q -11 + 13 q -1 -14 q -2 + 12 q -3 -9 q -4 + 6 q -5 -3 q -6 + q -7$ }

In[5]:= DeleteCases[Select[AllKnots[], (A === Alexander[#][t]) &], K]

KnotTheory::loading: Loading precomputed data in DTCode4KnotsTo11`.

KnotTheory::credits: The GaussCode to PD conversion was written by Siddarth Sankaran at the University of Toronto in the summer of 2005.

Out[5]= {K11a118,}

In[6]:= DeleteCases[ Select[ AllKnots[], (J === Jones[#][q] || (J /. q -> 1/q) === Jones[#][q]) & ], K ]

KnotTheory::loading: Loading precomputed data in Jones4Knots11`.

Out[6]= {}

[edit] Vassiliev invariants

V₂ and V₃:

(-2, 3)

V_2,1 through V_6,9:

V_2,1

V_3,1

V_4,1

V_4,2

V_4,3

V_5,1

V_5,2

V_5,3

V_5,4

V_6,1

V_6,2

V_6,3

V_6,4

V_6,5

V_6,6

V_6,7

V_6,8

V_6,9

-8

24

32

$-\frac{28}{3}$

$\frac{4}{3}$

-192

-240

-128

24

$-\frac{256}{3}$

288

$\frac{224}{3}$

$-\frac{32}{3}$

$\frac{11729}{15}$

$\frac{268}{5}$

$\frac{16796}{45}$

$-\frac{401}{9}$

$\frac{929}{15}$

V_2,1 through V_6,9 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.

[edit] Khovanov Homology

The coefficients of the monomials

t r q j

are shown, along with their alternating sums

χ

(fixed

j

, alternation over

r

). The squares with yellow highlighting are those on the "critical diagonals", where

j -2 r = s + 1

j -2 r = s -1

, where

s =

-2 is the signature of K11a90. Nonzero entries off the critical diagonals (if any exist) are highlighted in red.

\		r
	\
j		\

-6

-5

-4

-3

-2

-1

-2

-1

-3

-1

-5

-2

-7

-9

-3

-11

-13

-2

-15

Integral Khovanov Homology

(db, data source)

$\dim{\mathcal G}_{2r+i}\operatorname{KH}^r_{\mathbb Z}$	$i = -3$	$i = -1$
$r = -6$	${\mathbb Z}$
$r = -5$	${\mathbb Z}^{2}\oplus{\mathbb Z}_2$	${\mathbb Z}$
$r = -4$	${\mathbb Z}^{4}\oplus{\mathbb Z}_2^{2}$	${\mathbb Z}^{2}$
$r = -3$	${\mathbb Z}^{5}\oplus{\mathbb Z}_2^{4}$	${\mathbb Z}^{4}$
$r = -2$	${\mathbb Z}^{7}\oplus{\mathbb Z}_2^{5}$	${\mathbb Z}^{5}$
$r = -1$	${\mathbb Z}^{7}\oplus{\mathbb Z}_2^{7}$	${\mathbb Z}^{7}$
$r = 0$	${\mathbb Z}^{6}\oplus{\mathbb Z}_2^{7}$	${\mathbb Z}^{8}$
$r = 1$	${\mathbb Z}^{6}\oplus{\mathbb Z}_2^{5}$	${\mathbb Z}^{5}$
$r = 2$	${\mathbb Z}^{3}\oplus{\mathbb Z}_2^{6}$	${\mathbb Z}^{6}$
$r = 3$	${\mathbb Z}^{2}\oplus{\mathbb Z}_2^{3}$	${\mathbb Z}^{3}$
$r = 4$	${\mathbb Z}\oplus{\mathbb Z}_2^{2}$	${\mathbb Z}^{2}$
$r = 5$	${\mathbb Z}_2$	${\mathbb Z}$