9 21

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9_22

Contents

Image:9 21.gif
(KnotPlot image)

See the full Rolfsen Knot Table.

Visit 9 21's page at the Knot Server (KnotPlot driven, includes 3D interactive images!)

Visit 9_21's page at Knotilus!

Visit 9 21's page at the original Knot Atlas!


[edit] Knot presentations

Planar diagram presentation X1425 X9,12,10,13 X3,11,4,10 X11,3,12,2 X13,1,14,18 X5,15,6,14 X17,7,18,6 X7,17,8,16 X15,9,16,8
Gauss code -1, 4, -3, 1, -6, 7, -8, 9, -2, 3, -4, 2, -5, 6, -9, 8, -7, 5
Dowker-Thistlethwaite code 4 10 14 16 12 2 18 8 6
Conway Notation [31122]


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

Length is 10, width is 5,

Braid index is 5

Image:9 21_ML.gif Image:9 21_AP.gif
[{11, 6}, {7, 5}, {6, 10}, {1, 7}, {8, 11}, {10, 4}, {5, 2}, {3, 1}, {4, 9}, {2, 8}, {9, 3}]

[edit Notes on presentations of 9 21]


[edit] Three dimensional invariants

Symmetry type Reversible
Unknotting number 1
3-genus 2
Bridge index 2
Super bridge index {4,7}
Nakanishi index 1
Maximal Thurston-Bennequin number [-1][-10]
Hyperbolic Volume 10.1833
A-Polynomial See Data:9 21/A-polynomial

[edit Notes for 9 21's three dimensional invariants]

[edit] Four dimensional invariants

Smooth 4 genus 1
Topological 4 genus 1
Concordance genus 2
Rasmussen s-Invariant 2

[edit Notes for 9 21's four dimensional invariants]

[edit] Polynomial invariants

Alexander polynomial −2t2 + 11t−17 + 11t−1−2t−2
Conway polynomial −2z4 + 3z2 + 1
2nd Alexander ideal (db, data sources) {1}
Determinant and Signature { 43, 2 }
Jones polynomial q8 + 2q7−4q6 + 6q5−7q4 + 8q3−6q2 + 5q−3 + q−1
HOMFLY-PT polynomial (db, data sources) z4a−2z4a−4 + 2z2a−6 + z2 + a−2 + a−6a−8
Kauffman polynomial (db, data sources) z8a−4 + z8a−6 + 3z7a−3 + 5z7a−5 + 2z7a−7 + 4z6a−2 + 4z6a−4 + 2z6a−6 + 2z6a−8 + 3z5a−1−3z5a−3−10z5a−5−3z5a−7 + z5a−9−6z4a−2−9z4a−4−7z4a−6−5z4a−8 + z4−4z3a−1 + 2z3a−3 + 9z3a−5−3z3a−9 + 3z2a−2 + 6z2a−4 + 5z2a−6 + 3z2a−8z2za−3−3za−5 + 2za−9a−2a−6a−8
The A2 invariant q4q2−1 + 2q−2q−4 + 2q−6 + q−8 + q−12q−14 + 2q−16q−20 + q−22q−24q−26
The G2 invariant q18−2q16 + 4q14−6q12 + 4q10q8−4q6 + 13q4−17q2 + 22−19q−2 + 5q−4 + 10q−6−27q−8 + 38q−10−39q−12 + 28q−14−7q−16−17q−18 + 36q−20−40q−22 + 30q−24−9q−26−13q−28 + 24q−30−21q−32 + 8q−34 + 18q−36−33q−38 + 40q−40−24q−42−4q−44 + 36q−46−58q−48 + 63q−50−46q−52 + 17q−54 + 18q−56−45q−58 + 57q−60−50q−62 + 27q−64−25q−68 + 32q−70−23q−72 + 7q−74 + 16q−76−28q−78 + 26q−80−10q−82−14q−84 + 36q−86−44q−88 + 36q−90−17q−92−8q−94 + 27q−96−37q−98 + 35q−100−23q−102 + 6q−104 + 6q−106−16q−108 + 16q−110−14q−112 + 9q−114−3q−116−2q−118 + 3q−120−4q−122 + 3q−124q−126 + q−128

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

Same Alexander/Conway Polynomial: {}

Same Jones Polynomial (up to mirroring, q\leftrightarrow q^{-1}): {K11n129,}

[edit] Vassiliev invariants

V2 and V3: (3, 6)

[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 = 2 is the signature of 9 21. Nonzero entries off the critical diagonals (if any exist) are highlighted in red.   
\ r
  \  
j \
-2-101234567χ
17         1-1
15        1 1
13       31 -2
11      31  2
9     43   -1
7    43    1
5   24     2
3  34      -1
1 13       2
-1 2        -2
-31         1
Integral Khovanov Homology

(db, data source)

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