9 20

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9_19

9_21

Contents

Image:9 20.gif
(KnotPlot image)

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[edit] Knot presentations

Planar diagram presentation X1425 X3,10,4,11 X5,14,6,15 X7,16,8,17 X11,1,12,18 X15,6,16,7 X17,13,18,12 X13,8,14,9 X9,2,10,3
Gauss code -1, 9, -2, 1, -3, 6, -4, 8, -9, 2, -5, 7, -8, 3, -6, 4, -7, 5
Dowker-Thistlethwaite code 4 10 14 16 2 18 8 6 12
Conway Notation [31212]


Minimum Braid Representative A Morse Link Presentation An Arc Presentation
Image:BraidPart3.gifImage:BraidPart3.gifImage:BraidPart3.gifImage:BraidPart0.gifImage:BraidPart3.gifImage:BraidPart0.gifImage:BraidPart0.gifImage:BraidPart0.gif
Image:BraidPart4.gifImage:BraidPart4.gifImage:BraidPart4.gifImage:BraidPart1.gifImage:BraidPart4.gifImage:BraidPart1.gifImage:BraidPart0.gifImage:BraidPart0.gif
Image:BraidPart0.gifImage:BraidPart0.gifImage:BraidPart0.gifImage:BraidPart2.gifImage:BraidPart3.gifImage:BraidPart2.gifImage:BraidPart3.gifImage:BraidPart3.gif
Image:BraidPart0.gifImage:BraidPart0.gifImage:BraidPart0.gifImage:BraidPart0.gifImage:BraidPart4.gifImage:BraidPart0.gifImage:BraidPart4.gifImage:BraidPart4.gif

Length is 9, width is 4,

Braid index is 4

Image:9 20_ML.gif Image:9 20_AP.gif
[{12, 2}, {1, 10}, {8, 11}, {10, 12}, {9, 3}, {2, 4}, {3, 5}, {4, 8}, {6, 9}, {5, 7}, {11, 6}, {7, 1}]

[edit Notes on presentations of 9 20]


[edit] Three dimensional invariants

Symmetry type Reversible
Unknotting number 2
3-genus 3
Bridge index 2
Super bridge index {4,6}
Nakanishi index 1
Maximal Thurston-Bennequin number [-12][1]
Hyperbolic Volume 9.6443
A-Polynomial See Data:9 20/A-polynomial

[edit Notes for 9 20's three dimensional invariants]

[edit] Four dimensional invariants

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

[edit Notes for 9 20's four dimensional invariants]

[edit] Polynomial invariants

Alexander polynomial t3 + 5t2−9t + 11−9t−1 + 5t−2t−3
Conway polynomial z6z4 + 2z2 + 1
2nd Alexander ideal (db, data sources) {1}
Determinant and Signature { 41, -4 }
Jones polynomial 1−2q−1 + 4q−2−5q−3 + 7q−4−7q−5 + 6q−6−5q−7 + 3q−8q−9
HOMFLY-PT polynomial (db, data sources) z2a8a8 + 2z4a6 + 5z2a6 + 2a6z6a4−4z4a4−5z2a4−2a4 + z4a2 + 3z2a2 + 2a2
Kauffman polynomial (db, data sources) z3a11 + 3z4a10z2a10 + 5z5a9−5z3a9 + 2za9 + 5z6a8−6z4a8 + 3z2a8a8 + 3z7a7−7z3a7 + 2za7 + z8a6 + 5z6a6−16z4a6 + 10z2a6−2a6 + 5z7a5−12z5a5 + 5z3a5 + z8a4 + z6a4−11z4a4 + 11z2a4−2a4 + 2z7a3−7z5a3 + 6z3a3 + z6a2−4z4a2 + 5z2a2−2a2
The A2 invariant q28 + q24q22 + q20q18 + q14q12 + 2q10q8 + q6 + q4 + 1
The G2 invariant q148−2q146 + 3q144−4q142 + 2q140q138−2q136 + 9q134−12q132 + 15q130−13q128 + 5q126 + 2q124−13q122 + 23q120−27q118 + 23q116−13q114q112 + 15q110−23q108 + 25q106−21q104 + 5q102 + 7q100−17q98 + 16q96−5q94−9q92 + 23q90−24q88 + 14q86 + 3q84−26q82 + 44q80−44q78 + 30q76−4q74−21q72 + 43q70−45q68 + 33q66−17q64−6q62 + 22q60−28q58 + 22q56−6q54−9q52 + 19q50−19q48 + 7q46 + 8q44−23q42 + 31q40−28q38 + 12q36 + 10q34−26q32 + 36q30−30q28 + 17q26q24−13q22 + 21q20−19q18 + 14q16−3q14−2q12 + 5q10−5q8 + 4q6q4 + q2

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

Same Alexander/Conway Polynomial: {10_149, K11n26,}

Same Jones Polynomial (up to mirroring, q\leftrightarrow q^{-1}): {K11n90,}

[edit] Vassiliev invariants

V2 and V3: (2, -4)

[edit] Khovanov Homology

The coefficients of the monomials trqj 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−2r = s + 1 or j−2r = s−1, where s = -4 is the signature of 9 20. Nonzero entries off the critical diagonals (if any exist) are highlighted in red.   
\ r
  \  
j \
-7-6-5-4-3-2-1012χ
1         11
-1        1 -1
-3       31 2
-5      32  -1
-7     42   2
-9    33    0
-11   34     -1
-13  23      1
-15 13       -2
-17 2        2
-191         -1
Integral Khovanov Homology

(db, data source)

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

[edit] The Coloured Jones Polynomials

[edit] Computer Talk

Much of the above data can be recomputed by Mathematica using the package KnotTheory`. See A Sample KnotTheory` Session, or any of the Computer Talk sections above.

[edit] Modifying This Page

Read me first: Modifying Knot Pages

See/edit the Rolfsen Knot Page master template (intermediate).

See/edit the Rolfsen_Splice_Base (expert).

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