10 21

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Contents

Image:10 21.gif
(KnotPlot image)

See the full Rolfsen Knot Table.

Visit 10 21's page at the Knot Server (KnotPlot driven, includes 3D interactive images!)

Visit 10_21's page at Knotilus!

Visit 10 21's page at the original Knot Atlas!


[edit] Knot presentations

Planar diagram presentation X1425 X5,14,6,15 X3,13,4,12 X13,3,14,2 X7,16,8,17 X11,20,12,1 X15,6,16,7 X19,8,20,9 X9,18,10,19 X17,10,18,11
Gauss code -1, 4, -3, 1, -2, 7, -5, 8, -9, 10, -6, 3, -4, 2, -7, 5, -10, 9, -8, 6
Dowker-Thistlethwaite code 4 12 14 16 18 20 2 6 10 8
Conway Notation [3412]


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

Length is 11, width is 4,

Braid index is 4

Image:10 21_ML.gif Image:10 21_AP.gif
[{12, 5}, {1, 10}, {11, 6}, {5, 7}, {10, 12}, {6, 8}, {7, 9}, {4, 11}, {8, 3}, {2, 4}, {3, 1}, {9, 2}]

[edit Notes on presentations of 10 21]


[edit] Three dimensional invariants

Symmetry type Reversible
Unknotting number 2
3-genus 3
Bridge index 2
Super bridge index Missing
Nakanishi index 1
Maximal Thurston-Bennequin number [-13][1]
Hyperbolic Volume 9.67514
A-Polynomial See Data:10 21/A-polynomial

[edit Notes for 10 21'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 10 21's four dimensional invariants]

[edit] Polynomial invariants

Alexander polynomial −2t3 + 7t2−9t + 9−9t−1 + 7t−2−2t−3
Conway polynomial −2z6−5z4 + z2 + 1
2nd Alexander ideal (db, data sources) {1}
Determinant and Signature { 45, -4 }
Jones polynomial 1−2q−1 + 4q−2−5q−3 + 7q−4−7q−5 + 7q−6−6q−7 + 3q−8−2q−9 + q−10
HOMFLY-PT polynomial (db, data sources) z4a8 + 3z2a8 + a8z6a6−4z4a6−5z2a6−3a6z6a4−3z4a4 + 2a4 + z4a2 + 3z2a2 + a2
Kauffman polynomial (db, data sources) z4a12−2z2a12 + 2z5a11−4z3a11 + 2za11 + 2z6a10−2z4a10 + 2z7a9−2z5a9 + 3za9 + 2z8a8−5z6a8 + 9z4a8−5z2a8 + a8 + z9a7z7a7 + 2z3a7za7 + 4z8a6−14z6a6 + 20z4a6−14z2a6 + 3a6 + z9a5z7a5−3z5a5 + 3z3a5−2za5 + 2z8a4−6z6a4 + 4z4a4−3z2a4 + 2a4 + 2z7a3−7z5a3 + 5z3a3 + z6a2−4z4a2 + 4z2a2a2
The A2 invariant q30−2q22−2q18 + q14 + 3q10 + q6 + 1
The G2 invariant q162q160 + 2q158−3q156 + q154q152−3q150 + 6q148−7q146 + 7q144−6q142 + 3q140 + 4q138−9q136 + 12q134−14q132 + 12q130−7q128 + q126 + 6q124−12q122 + 24q120−18q118 + 14q116−7q114−4q112 + 15q110−20q108 + 17q106−9q104−3q102 + 12q100−15q98 + 5q96 + 6q94−20q92 + 21q90−20q88 + 2q86 + 16q84−33q82 + 38q80−32q78 + 13q76 + 8q74−28q72 + 36q70−34q68 + 22q66−4q64−13q62 + 25q60−21q58 + 13q56 + 4q54−15q52 + 19q50−13q48q46 + 19q44−28q42 + 30q40−16q38−2q36 + 21q34−29q32 + 30q30−21q28 + 7q26 + 6q24−16q22 + 18q20−13q18 + 9q16q14−2q12 + 4q10−4q8 + 3q6q4 + q2

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

Same Alexander/Conway Polynomial: {K11n69,}

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

[edit] Vassiliev invariants

V2 and V3: (1, 0)

[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 10 21. Nonzero entries off the critical diagonals (if any exist) are highlighted in red.   
\ r
  \  
j \
-8-7-6-5-4-3-2-1012χ
1          11
-1         1 -1
-3        31 2
-5       32  -1
-7      42   2
-9     33    0
-11    44     0
-13   23      1
-15  14       -3
-17 12        1
-19 1         -1
-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}\oplus{\mathbb Z}_2 {\mathbb Z}
r = −6 {\mathbb Z}^{2}\oplus{\mathbb Z}_2 {\mathbb Z}
r = −5 {\mathbb Z}^{4}\oplus{\mathbb Z}_2^{2} {\mathbb Z}^{2}
r = −4 {\mathbb Z}^{3}\oplus{\mathbb Z}_2^{4} {\mathbb Z}^{4}
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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