L7n2

L7n1

L8a1

(Knotscape image)	See the full Thistlethwaite Link Table (up to 11 crossings). Visit L7n2 at Knotilus!
	L7n2 is $7^2_8$ in the Rolfsen table of links.

Link Presentations

[edit Notes on L7n2's Link Presentations]

Planar diagram presentation	X6172 X12,7,13,8 X13,1,14,4 X5,10,6,11 X3849 X9,14,10,5 X2,12,3,11
Gauss code	{1, -7, -5, 3}, {-4, -1, 2, 5, -6, 4, 7, -2, -3, 6}

A Braid Representative
A Morse Link Presentation

Polynomial invariants

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

Integral Khovanov Homology (db, data source)

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

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.

L7n1 L8a1