L8a12

L8a11

L8a13

(Knotscape image)	See the full Thistlethwaite Link Table (up to 11 crossings). Visit L8a12 at Knotilus!
	L8a12 is $8^2_{2}$ in the Rolfsen table of links.

Link Presentations

[edit Notes on L8a12's Link Presentations]

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

A Braid Representative
A Morse Link Presentation

Polynomial invariants

Multivariable Alexander Polynomial (in $u$, $v$, $w$, ...)	$\frac{-t(2)^2 t(1)^3-t(2)^3 t(1)^2+t(2)^2 t(1)^2-t(2) t(1)^2-t(2)^2 t(1)+t(2) t(1)-t(1)-t(2)}{t(1)^{3/2} t(2)^{3/2}}$ (db)
Jones polynomial	$-\frac{1}{q^{5/2}}+\frac{1}{q^{7/2}}-\frac{2}{q^{9/2}}+\frac{2}{q^{11/2}}-\frac{3}{q^{13/2}}+\frac{3}{q^{15/2}}-\frac{2}{q^{17/2}}+\frac{1}{q^{19/2}}-\frac{1}{q^{21/2}}$ (db)
Signature	-5 (db)
HOMFLY-PT polynomial	$a^9 z^3+3 a^9 z+a^9 z^{-1} -a^7 z^5-4 a^7 z^3-4 a^7 z-a^7 z^{-1} -a^5 z^5-4 a^5 z^3-3 a^5 z$ (db)
Kauffman polynomial	$-z^3 a^{13}+2 z a^{13}-z^4 a^{12}+z^2 a^{12}-z^5 a^{11}+z^3 a^{11}-z a^{11}-z^6 a^{10}+2 z^4 a^{10}-3 z^2 a^{10}-z^7 a^9+4 z^5 a^9-8 z^3 a^9+5 z a^9-a^9 z^{-1} -2 z^6 a^8+6 z^4 a^8-5 z^2 a^8+a^8-z^7 a^7+4 z^5 a^7-6 z^3 a^7+5 z a^7-a^7 z^{-1} -z^6 a^6+3 z^4 a^6-z^2 a^6-z^5 a^5+4 z^3 a^5-3 z a^5$ (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   \ -8 -7 -6 -5 -4 -3 -2 -1 0 χ -4                 1 1 -6               1 1 0 -8             1     1 -10           1 1     0 -12         2 1       1 -14       1 1         0 -16     1 2           -1 -18     1             1 -20 1 1               0 -22 1                 1

Integral Khovanov Homology (db, data source)

$\dim{\mathcal G}_{2r+i}\operatorname{KH}^r_{\mathbb Z}$ $i=-6$ $i=-4$ $r=-8$ ${\mathbb Z}$ ${\mathbb Z}$ $r=-7$ ${\mathbb Z}$ $r=-6$ ${\mathbb Z}\oplus{\mathbb Z}_2$ ${\mathbb Z}$ $r=-5$ ${\mathbb Z}^{2}\oplus{\mathbb Z}_2$ ${\mathbb Z}$ $r=-4$ ${\mathbb Z}\oplus{\mathbb Z}_2^{2}$ ${\mathbb Z}^{2}$ $r=-3$ ${\mathbb Z}\oplus{\mathbb Z}_2$ ${\mathbb Z}$ $r=-2$ ${\mathbb Z}\oplus{\mathbb Z}_2$ ${\mathbb Z}$ $r=-1$ ${\mathbb Z}_2$ ${\mathbb Z}$ $r=0$ ${\mathbb Z}$ ${\mathbb Z}$

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.

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