7 4

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7_3

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Contents

Image:7 4.gif
(KnotPlot image)

See the full Rolfsen Knot Table.

Visit 7 4's page at the Knot Server (KnotPlot driven, includes 3D interactive images!)

Visit 7_4's page at Knotilus!

Visit 7 4's page at the original Knot Atlas!

A 7-4 knot reducted from TakaraMusubi with 9 crossings [1]
A 7-4 knot reducted from TakaraMusubi with 9 crossings [1]
a knot seen at the Castle of Kornik [2]
a knot seen at the Castle of Kornik [2]
Susan Williams' medallion [3], the "Endless knot" of Buddhism [4]
Susan Williams' medallion [3], the "Endless knot" of Buddhism [4]
A laser cut by Tom Longtin [5]
A laser cut by Tom Longtin [5]
TakaraMusubi knot seen in Japanese simbols, or Kolam in South India [6]
TakaraMusubi knot seen in Japanese simbols, or Kolam in South India [6]
Unicursal hexagram of occultism
Unicursal hexagram of occultism

[edit] Knot presentations

Planar diagram presentation X6271 X12,6,13,5 X14,8,1,7 X8,14,9,13 X2,12,3,11 X10,4,11,3 X4,10,5,9
Gauss code 1, -5, 6, -7, 2, -1, 3, -4, 7, -6, 5, -2, 4, -3
Dowker-Thistlethwaite code 6 10 12 14 4 2 8
Conway Notation [313]


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:BraidPart1.gifImage:BraidPart0.gifImage:BraidPart3.gifImage:BraidPart0.gif
Image:BraidPart0.gifImage:BraidPart0.gifImage:BraidPart2.gifImage:BraidPart0.gifImage:BraidPart2.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:7 4_ML.gif Image:7 4_AP.gif
[{3, 5}, {6, 4}, {5, 7}, {2, 6}, {8, 3}, {7, 9}, {1, 8}, {9, 2}, {4, 1}]

[edit Notes on presentations of 7 4]

Knot 7_4.
Knot 7_4.
A graph, knot 7_4.
A graph, knot 7_4.

[edit] Three dimensional invariants

Symmetry type Reversible
Unknotting number 2
3-genus 1
Bridge index 2
Super bridge index {3,4}
Nakanishi index 1
Maximal Thurston-Bennequin number [1][-10]
Hyperbolic Volume 5.13794
A-Polynomial See Data:7 4/A-polynomial

[edit Notes for 7 4's three dimensional invariants]

[edit] Four dimensional invariants

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

[edit Notes for 7 4's four dimensional invariants]

[edit] Polynomial invariants

Alexander polynomial 4t−7 + 4t−1
Conway polynomial 4z2 + 1
2nd Alexander ideal (db, data sources) {1}
Determinant and Signature { 15, 2 }
Jones polynomial q8 + q7−2q6 + 3q5−2q4 + 3q3−2q2 + q
HOMFLY-PT polynomial (db, data sources) z2a−2 + 2z2a−4 + z2a−6 + 2a−4a−8
Kauffman polynomial (db, data sources) z6a−6 + z6a−8 + 2z5a−5 + 3z5a−7 + z5a−9 + 3z4a−4−3z4a−8 + 2z3a−3−2z3a−5−8z3a−7−4z3a−9 + z2a−2−4z2a−4−3z2a−6 + 2z2a−8 + 4za−7 + 4za−9 + 2a−4a−8
The A2 invariant q−2q−4 + q−8 + q−10 + 2q−12 + q−14 + q−16q−20q−24q−26
The G2 invariant q−10q−12 + q−14q−16q−22 + 4q−24−2q−26 + 2q−28q−30 + q−34−2q−36 + 3q−38−2q−40 + q−44 + 2q−48 + q−50q−52 + 2q−54q−56 + 3q−58 + q−60−2q−62 + 6q−64−3q−66 + 4q−68 + 2q−70−3q−72 + 4q−74−3q−76 + 3q−78q−80q−82 + q−84−2q−86 + 2q−88−3q−92q−94−2q−96−4q−102 + 2q−104−3q−106 + q−108 + q−110−4q−112 + 3q−114−2q−116 + q−118−2q−122 + 2q−124 + q−128

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

Same Alexander/Conway Polynomial: {9_2,}

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

[edit] Vassiliev invariants

V2 and V3: (4, 8)

[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 7 4. Nonzero entries off the critical diagonals (if any exist) are highlighted in red.   
\ r
  \  
j \
01234567χ
17       1-1
15        0
13     21 -1
11    1   1
9   12   1
7  21    1
5  1     1
312      -1
11       1
Integral Khovanov Homology

(db, data source)

  
\dim{\mathcal G}_{2r+i}\operatorname{KH}^r_{\mathbb Z} i = 1 i = 3
r = 0 {\mathbb Z} {\mathbb Z}
r = 1 {\mathbb Z}^{2}
r = 2 {\mathbb Z}\oplus{\mathbb Z}_2^{2} {\mathbb Z}^{2}
r = 3 {\mathbb Z}\oplus{\mathbb Z}_2 {\mathbb Z}
r = 4 {\mathbb Z}^{2}\oplus{\mathbb Z}_2 {\mathbb Z}
r = 5 {\mathbb Z}_2^{2} {\mathbb Z}^{2}
r = 6 {\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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Retrieved from "http://katlas.org/wiki/7_4"
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