L9n27

L9n26

L9n28

(Knotscape image)	See the full Thistlethwaite Link Table (up to 11 crossings). Visit L9n27 at Knotilus!
	L9n27 is $9^3_{21}$ in the Rolfsen table of links.

Link Presentations

[edit Notes on L9n27's Link Presentations]

Planar diagram presentation	X6172 X12,7,13,8 X4,13,1,14 X9,18,10,15 X8493 X5,17,6,16 X17,5,18,14 X15,10,16,11 X2,12,3,11
Gauss code	{1, -9, 5, -3}, {-8, 6, -7, 4}, {-6, -1, 2, -5, -4, 8, 9, -2, 3, 7}

A Braid Representative
A Morse Link Presentation

Polynomial invariants

Multivariable Alexander Polynomial (in $u$, $v$, $w$, ...)	0 (db)
Jones polynomial	$q^3-q^2+q+1+ q^{-1} + q^{-2} + q^{-4} - q^{-5}$ (db)
Signature	-1 (db)
HOMFLY-PT polynomial	$-z^2 a^4-2 a^4+z^4 a^2+5 z^2 a^2+a^2 z^{-2} +6 a^2-z^4-5 z^2-2 z^{-2} -6+z^2 a^{-2} + a^{-2} z^{-2} +2 a^{-2}$ (db)
Kauffman polynomial	$a z^7+z^7 a^{-1} +a^4 z^6+2 a^2 z^6+z^6 a^{-2} +2 z^6+a^5 z^5+a^3 z^5-5 a z^5-5 z^5 a^{-1} -5 a^4 z^4-13 a^2 z^4-5 z^4 a^{-2} -13 z^4-4 a^5 z^3-6 a^3 z^3+2 a z^3+4 z^3 a^{-1} +6 a^4 z^2+22 a^2 z^2+6 z^2 a^{-2} +22 z^2+2 a^5 z+6 a^3 z+6 a z+2 z a^{-1} -4 a^4-12 a^2-4 a^{-2} -11-2 a z^{-1} -2 a^{-1} z^{-1} +a^2 z^{-2} + a^{-2} z^{-2} +2 z^{-2}$ (db)

Khovanov Homology

The coefficients of the monomials $t^rq^j$ are shown, along with their alternating sums $\chi$ (fixed $j$, alternation over $r$).

\   r    \    j   \ -5 -4 -3 -2 -1 0 1 2 3 4 χ 7                   1 1 5                     0 3               1 1   0 1           3 1       2 -1         1 4 1       2 -3       1 1 2         2 -5       1             1 -7   1 1 1             1 -9                     0 -11 1                   -1

Integral Khovanov Homology (db, data source)

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

Computer Talk

Much of the above data can be recomputed by Mathematica using the package KnotTheory`. See A Sample KnotTheory` Session.

Modifying This Page

Read me first: Modifying Knot Pages See/edit the Link Page master template (intermediate). See/edit the Link_Splice_Base (expert). Back to the top.

L9n26 L9n28