8 15

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Contents

Image:8 15.gif
(KnotPlot image)

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Visit 8 15's page at the original Knot Atlas!


[edit] Knot presentations

Planar diagram presentation X1425 X3849 X5,12,6,13 X13,16,14,1 X9,14,10,15 X15,10,16,11 X11,6,12,7 X7283
Gauss code -1, 8, -2, 1, -3, 7, -8, 2, -5, 6, -7, 3, -4, 5, -6, 4
Dowker-Thistlethwaite code 4 8 12 2 14 6 16 10
Conway Notation [21,21,2]


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

Length is 9, width is 4,

Braid index is 4

Image:8 15_ML.gif Image:8 15_AP.gif
[{11, 3}, {2, 9}, {7, 10}, {9, 11}, {8, 4}, {3, 7}, {4, 1}, {5, 8}, {6, 2}, {10, 5}, {1, 6}]

[edit Notes on presentations of 8 15]

Knot 8_15.
Knot 8_15.
A graph, knot 8_15.
A graph, knot 8_15.

[edit] Three dimensional invariants

Symmetry type Reversible
Unknotting number 2
3-genus 2
Bridge index 3
Super bridge index {4,6}
Nakanishi index 1
Maximal Thurston-Bennequin number [-13][3]
Hyperbolic Volume 9.93065
A-Polynomial See Data:8 15/A-polynomial

[edit Notes for 8 15's three dimensional invariants]

[edit] Four dimensional invariants

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

[edit Notes for 8 15's four dimensional invariants]

[edit] Polynomial invariants

Alexander polynomial 3t2−8t + 11−8t−1 + 3t−2
Conway polynomial 3z4 + 4z2 + 1
2nd Alexander ideal (db, data sources) {1}
Determinant and Signature { 33, -4 }
Jones polynomial q−2−2q−3 + 5q−4−5q−5 + 6q−6−6q−7 + 4q−8−3q−9 + q−10
HOMFLY-PT polynomial (db, data sources) a10−3z2a8−4a8 + 2z4a6 + 5z2a6 + 3a6 + z4a4 + 2z2a4 + a4
Kauffman polynomial (db, data sources) z4a12z2a12 + 3z5a11−5z3a11 + 2za11 + 3z6a10−3z4a10a10 + z7a9 + 6z5a9−14z3a9 + 8za9 + 6z6a8−10z4a8 + 8z2a8−4a8 + z7a7 + 5z5a7−11z3a7 + 6za7 + 3z6a6−5z4a6 + 5z2a6−3a6 + 2z5a5−2z3a5 + z4a4−2z2a4 + a4
The A2 invariant q32 + q30−2q28q26−2q24−2q22 + q20 + 3q16 + q14 + q12 + 2q10q8 + q6
The G2 invariant q162−2q160 + 4q158−6q156 + 3q154q152−6q150 + 14q148−18q146 + 20q144−12q142q140 + 17q138−27q136 + 34q134−24q132 + 7q130 + 10q128−21q126 + 25q124−16q122 + q120 + 14q118−20q116 + 12q114−24q110 + 34q108−36q106 + 18q104−2q102−24q100 + 40q98−47q96 + 34q94−18q92−7q90 + 25q88−33q86 + 26q84−9q82−2q80 + 16q78−17q76 + 9q74 + 10q72−21q70 + 29q68−21q66 + 6q64 + 17q62−27q60 + 33q58−23q56 + 12q54 + 2q52−14q50 + 17q48−14q46 + 10q44−2q42q40 + 3q38−3q36 + 3q34q32 + q30

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

Same Alexander/Conway Polynomial: {K11n65,}

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

[edit] Vassiliev invariants

V2 and V3: (4, -7)

[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 8 15. Nonzero entries off the critical diagonals (if any exist) are highlighted in red.   
\ r
  \  
j \
-8-7-6-5-4-3-2-10χ
-3        11
-5       21-1
-7      3  3
-9     22  0
-11    43   1
-13   22    0
-15  24     -2
-17 12      1
-19 2       -2
-211        1
Integral Khovanov Homology

(db, data source)

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