L9a40

L9a39

L9a41

(Knotscape image)	See the full Thistlethwaite Link Table (up to 11 crossings). Visit L9a40 at Knotilus!
	L9a40 is $9^2_{4}$ in the Rolfsen table of links.

National swiss museum

Povray depiction

Link Presentations

[edit Notes on L9a40's Link Presentations]

Planar diagram presentation	X10,1,11,2 X2,11,3,12 X12,3,13,4 X8,9,1,10 X18,13,9,14 X14,8,15,7 X16,6,17,5 X6,16,7,15 X4,18,5,17
Gauss code	{1, -2, 3, -9, 7, -8, 6, -4}, {4, -1, 2, -3, 5, -6, 8, -7, 9, -5}

A Braid Representative
A Morse Link Presentation

Polynomial invariants

Multivariable Alexander Polynomial (in $u$, $v$, $w$, ...)	$\frac{(u-1) (v-1) \left(u^2 v+u v^2+u v+u+v\right)}{u^{3/2} v^{3/2}}$ (db)
Jones polynomial	$-q^{5/2}+q^{3/2}-2 \sqrt{q}+\frac{3}{\sqrt{q}}-\frac{4}{q^{3/2}}+\frac{3}{q^{5/2}}-\frac{4}{q^{7/2}}+\frac{3}{q^{9/2}}-\frac{2}{q^{11/2}}+\frac{1}{q^{13/2}}$ (db)
Signature	-3 (db)
HOMFLY-PT polynomial	$-z^3 a^5-2 z a^5+z^5 a^3+3 z^3 a^3+z a^3+z^5 a+4 z^3 a+4 z a+a z^{-1} -z^3 a^{-1} -3 z a^{-1} - a^{-1} z^{-1}$ (db)
Kauffman polynomial	$a^8 z^2+2 a^7 z^3+3 a^6 z^4-2 a^6 z^2+4 a^5 z^5-8 a^5 z^3+4 a^5 z+3 a^4 z^6-6 a^4 z^4+a^4 z^2+2 a^3 z^7-4 a^3 z^5-2 a^3 z^3+2 a^3 z+a^2 z^8-2 a^2 z^6-2 a^2 z^4+2 a^2 z^2+3 a z^7+z^7 a^{-1} -14 a z^5-6 z^5 a^{-1} +19 a z^3+11 z^3 a^{-1} -8 a z+a z^{-1} -6 z a^{-1} + a^{-1} z^{-1} +z^8-5 z^6+7 z^4-2 z^2-1$ (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 6                   1 1 4                     0 2               2 1   1 0             1       -1 -2           3 2       1 -4         2 3         1 -6       2 1           1 -8     1 2             1 -10   1 2               -1 -12   1                 1 -14 1                   -1

Integral Khovanov Homology (db, data source)

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

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.

L9a39 L9a41