9 1

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8_21

9_2

Contents

Image:9 1.gif
(KnotPlot image)

See the full Rolfsen Knot Table.

Visit 9 1's page at the Knot Server (KnotPlot driven, includes 3D interactive images!)

Visit 9_1's page at Knotilus!

Visit 9 1's page at the original Knot Atlas!

9_1 is also known as "The Nonoil Knot", following the trefoil knot, the cinquefoil knot and the septoil knot.


[edit] Knot presentations

Planar diagram presentation X1,10,2,11 X3,12,4,13 X5,14,6,15 X7,16,8,17 X9,18,10,1 X11,2,12,3 X13,4,14,5 X15,6,16,7 X17,8,18,9
Gauss code -1, 6, -2, 7, -3, 8, -4, 9, -5, 1, -6, 2, -7, 3, -8, 4, -9, 5
Dowker-Thistlethwaite code 10 12 14 16 18 2 4 6 8
Conway Notation [9]


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

Length is 9, width is 2,

Braid index is 2

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

[edit Notes on presentations of 9 1]


[edit] Three dimensional invariants

Symmetry type Reversible
Unknotting number 4
3-genus 4
Bridge index 2
Super bridge index 4
Nakanishi index 1
Maximal Thurston-Bennequin number [-18][7]
Hyperbolic Volume Not hyperbolic
A-Polynomial See Data:9 1/A-polynomial

[edit Notes for 9 1's three dimensional invariants]

[edit] Four dimensional invariants

Smooth 4 genus 4
Topological 4 genus 4
Concordance genus 4
Rasmussen s-Invariant -8

[edit Notes for 9 1's four dimensional invariants]

[edit] Polynomial invariants

Alexander polynomial t4t3 + t2t + 1−t−1 + t−2t−3 + t−4
Conway polynomial z8 + 7z6 + 15z4 + 10z2 + 1
2nd Alexander ideal (db, data sources) {1}
Determinant and Signature { 9, -8 }
Jones polynomial q−4 + q−6q−7 + q−8q−9 + q−10q−11 + q−12q−13
HOMFLY-PT polynomial (db, data sources) z6a10−6z4a10−10z2a10−4a10 + z8a8 + 8z6a8 + 21z4a8 + 20z2a8 + 5a8
Kauffman polynomial (db, data sources) za17 + z2a16 + z3a15za15 + z4a14−2z2a14 + z5a13−3z3a13 + za13 + z6a12−4z4a12 + 3z2a12 + z7a11−5z5a11 + 6z3a11za11 + z8a10−7z6a10 + 16z4a10−14z2a10 + 4a10 + z7a9−6z5a9 + 10z3a9−4za9 + z8a8−8z6a8 + 21z4a8−20z2a8 + 5a8
The A2 invariant q38q36q34 + q22 + q20 + 2q18 + q16 + q14
The G2 invariant q216q172q170q164q162q160q154q152q126q120q118q116q114q108 + q100 + q98 + q94 + 2q92 + 2q90 + 2q88 + q86 + q84 + 2q82 + 2q80 + q78 + q74 + q72 + q70

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

Same Alexander/Conway Polynomial: {}

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

[edit] Vassiliev invariants

V2 and V3: (10, -30)

[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 = -8 is the signature of 9 1. Nonzero entries off the critical diagonals (if any exist) are highlighted in red.   
\ r
  \  
j \
-9-8-7-6-5-4-3-2-10χ
-7         11
-9         11
-11       1  1
-13          0
-15     11   0
-17          0
-19   11     0
-21          0
-23 11       0
-25          0
-271         -1
Integral Khovanov Homology

(db, data source)

  
\dim{\mathcal G}_{2r+i}\operatorname{KH}^r_{\mathbb Z} i = −9 i = −7
r = −9 {\mathbb Z}
r = −8 {\mathbb Z}_2 {\mathbb Z}
r = −7 {\mathbb Z}
r = −6 {\mathbb Z}_2 {\mathbb Z}
r = −5 {\mathbb Z}
r = −4 {\mathbb Z}_2 {\mathbb Z}
r = −3 {\mathbb Z}
r = −2 {\mathbb Z}_2 {\mathbb Z}
r = −1
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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8_21

9_2

Retrieved from "http://katlas.org/wiki/9_1"
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