6 1

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5_2

6_2

Contents

Image:6 1.gif
(KnotPlot image)

See the full Rolfsen Knot Table.

Visit 6 1's page at the Knot Server (KnotPlot driven, includes 3D interactive images!)

Visit 6_1's page at Knotilus!

Visit 6 1's page at the original Knot Atlas!

6_1 is also known as "Stevedore's Knot" (see e.g. [1]), and as the pretzel knot P(5,-1,-1).


A Kolam of a 3x3 dot array
A Kolam of a 3x3 dot array
3D depiction
3D depiction

[edit] Knot presentations

Planar diagram presentation X1425 X7,10,8,11 X3948 X9,3,10,2 X5,12,6,1 X11,6,12,7
Gauss code -1, 4, -3, 1, -5, 6, -2, 3, -4, 2, -6, 5
Dowker-Thistlethwaite code 4 8 12 10 2 6
Conway Notation [42]


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

Length is 7, width is 4,

Braid index is 4

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

[edit Notes on presentations of 6 1]

knot 6_1.
knot 6_1.
A graph, knot 6_1
A graph, knot 6_1

[edit] Three dimensional invariants

Symmetry type Reversible
Unknotting number 1
3-genus 1
Bridge index 2
Super bridge index {3,4}
Nakanishi index 1
Maximal Thurston-Bennequin number [-5][-3]
Hyperbolic Volume 3.16396
A-Polynomial See Data:6 1/A-polynomial

[edit Notes for 6 1's three dimensional invariants]
6_1 is a ribbon knot (drawings by Yoko Mizuma):

a ribbon diagram
a ribbon diagram
isotopy to a ribbon
isotopy to a ribbon
6_1 is doubly slice, by Scott Carter
6_1 is doubly slice, by Scott Carter
Scott Carter notes that 6_1 is doubly slice - it bounds two distinct slice disks. He says: "this was spoken of in Fox's Example 10, 11, and 12 in a Quick Trip through Knot Theory ... BTW, the cover of Carter and Saito's Knotted Surfaces and Their Diagrams contains an illustration of such a slice disk". A picture is on the right.

[edit] Four dimensional invariants

Smooth 4 genus 0
Topological 4 genus 0
Concordance genus 0
Rasmussen s-Invariant 0

[edit Notes for 6 1's four dimensional invariants]

[edit] Polynomial invariants

Alexander polynomial −2t + 5−2t−1
Conway polynomial 1−2z2
2nd Alexander ideal (db, data sources) {1}
Determinant and Signature { 9, 0 }
Jones polynomial q2q + 2−2q−1 + q−2q−3 + q−4
HOMFLY-PT polynomial (db, data sources) a4z2a2a2z2 + a−2
Kauffman polynomial (db, data sources) a3z5 + az5 + a4z4 + 2a2z4 + z4−3a3z3−2az3 + z3a−1−3a4z2−4a2z2 + z2a−2 + 2a3z + 2az + a4 + a2a−2
The A2 invariant q14 + q12q6q4 + q−2 + q−6 + q−8
The G2 invariant q66 + q62q60 + q56q54 + 2q52 + q46 + q42q38 + q32−2q28 + q26 + q24−2q20−2q18 + q16q14 + q12−2q10q8 + 2q6q4−1 + q−4 + q−10 + 2q−14q−18 + q−20 + q−24 + q−28 + q−34 + q−38

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

Same Alexander/Conway Polynomial: {9_46, K11n67, K11n97, K11n139,}

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

[edit] Vassiliev invariants

V2 and V3: (-2, 1)
V2,1 through V6,9:
V2,1 V3,1 V4,1 V4,2 V4,3 V5,1 V5,2 V5,3 V5,4 V6,1 V6,2 V6,3 V6,4 V6,5 V6,6 V6,7 V6,8 V6,9
−8 8 32 \frac{116}{3} \frac{52}{3} −64 -\frac{304}{3} -\frac{64}{3} −24 -\frac{256}{3} 32 -\frac{928}{3} -\frac{416}{3} -\frac{2791}{15} \frac{884}{15} -\frac{10084}{45} \frac{343}{9} -\frac{871}{15}

V2,1 through V6,9 were provided by Petr Dunin-Barkowski <barkovs@itep.ru>, Andrey Smirnov <asmirnov@itep.ru>, and Alexei Sleptsov <sleptsov@itep.ru> and uploaded on October 2010 by User:Drorbn. Note that they are normalized differently than V2 and V3.

[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 = 0 is the signature of 6 1. Nonzero entries off the critical diagonals (if any exist) are highlighted in red.   
\ r
  \  
j \
-4-3-2-1012χ
5      11
3       0
1    21 1
-1   11  0
-3   1   -1
-5 11    0
-7       0
-91      1
Integral Khovanov Homology

(db, data source)

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

Back to the top.

5_2

6_2

Retrieved from "http://katlas.org/wiki/6_1"
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