8 4

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8_3

8_5

Contents

Image:8 4.gif
(KnotPlot image)

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[edit] Knot presentations

Planar diagram presentation X6271 X14,10,15,9 X10,3,11,4 X2,13,3,14 X12,5,13,6 X16,8,1,7 X4,11,5,12 X8,16,9,15
Gauss code 1, -4, 3, -7, 5, -1, 6, -8, 2, -3, 7, -5, 4, -2, 8, -6
Dowker-Thistlethwaite code 6 10 12 16 14 4 2 8
Conway Notation [413]


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.gifImage:BraidPart0.gif
Image:BraidPart4.gifImage:BraidPart4.gifImage:BraidPart4.gifImage:BraidPart1.gifImage:BraidPart4.gifImage:BraidPart1.gifImage:BraidPart0.gifImage:BraidPart3.gifImage:BraidPart0.gif
Image:BraidPart0.gifImage:BraidPart0.gifImage:BraidPart0.gifImage:BraidPart2.gifImage:BraidPart0.gifImage:BraidPart2.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 9, width is 4,

Braid index is 4

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

[edit Notes on presentations of 8 4]

Knot 8_4.
Knot 8_4.
A graph, knot 8_4.
A graph, knot 8_4.

[edit] Three dimensional invariants

Symmetry type Reversible
Unknotting number 2
3-genus 2
Bridge index 2
Super bridge index {3,5}
Nakanishi index 1
Maximal Thurston-Bennequin number [-7][-3]
Hyperbolic Volume 5.50049
A-Polynomial See Data:8 4/A-polynomial

[edit Notes for 8 4'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 8 4's four dimensional invariants]

[edit] Polynomial invariants

Alexander polynomial −2t2 + 5t−5 + 5t−1−2t−2
Conway polynomial −2z4−3z2 + 1
2nd Alexander ideal (db, data sources) {1}
Determinant and Signature { 19, -2 }
Jones polynomial q3q2 + 2q−3 + 3q−1−3q−2 + 3q−3−2q−4 + q−5
HOMFLY-PT polynomial (db, data sources) z2a4 + a4z4a2−2z2a2z4−3z2−2 + z2a−2 + 2a−2
Kauffman polynomial (db, data sources) az7 + z7a−1 + 2a2z6 + z6a−2 + 3z6 + 3a3z5az5−4z5a−1 + 3a4z4−3a2z4−5z4a−2−11z4 + 2a5z3−5a3z3−3az3 + 4z3a−1 + a6z2−3a4z2a2z2 + 7z2a−2 + 10z2 + 2a3z + azza−1 + a4−2a−2−2
The A2 invariant q16 + q10 + q6q4q2−1−q−2 + q−4 + q−6 + q−8 + q−10
The G2 invariant q86q84 + q82q80q74 + 3q72−2q70 + 2q68−2q66 + q62−2q60 + 3q58−2q56 + q54 + q50 + 2q48q46 + 2q44 + 2q38q36 + q34 + 2q32−2q30 + 3q28−3q26 + 2q22−6q20 + 5q18−5q16 + 2q12−4q10 + 3q8−4q6 + q4q2−2 + q−2−2q−4 + q−6 + 2q−8−2q−10 + q−12q−14 + q−16 + 3q−18−4q−20 + 4q−22−2q−24 + q−26 + 4q−28−4q−30 + 4q−32q−34 + q−36 + q−38−2q−40 + 2q−42 + q−46

[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: (-3, 1)

[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 8 4. Nonzero entries off the critical diagonals (if any exist) are highlighted in red.   
\ r
  \  
j \
-4-3-2-101234χ
7        11
5         0
3      21 1
1     1   -1
-1    22   0
-3   22    0
-5  11     0
-7 12      1
-9 1       -1
-111        1
Integral Khovanov Homology

(db, data source)

  
\dim{\mathcal G}_{2r+i}\operatorname{KH}^r_{\mathbb Z} i = −3 i = −1
r = −4 {\mathbb Z}
r = −3 {\mathbb Z}\oplus{\mathbb Z}_2 {\mathbb Z}
r = −2 {\mathbb Z}^{2}\oplus{\mathbb Z}_2 {\mathbb Z}
r = −1 {\mathbb Z}\oplus{\mathbb Z}_2^{2} {\mathbb Z}^{2}
r = 0 {\mathbb Z}^{2}\oplus{\mathbb Z}_2 {\mathbb Z}^{2}
r = 1 {\mathbb Z}^{2}\oplus{\mathbb Z}_2 {\mathbb Z}
r = 2 {\mathbb Z}_2^{2} {\mathbb Z}^{2}
r = 3 {\mathbb Z}
r = 4 {\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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8_3

8_5

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