L7a5

L7a4

L7a6

(Knotscape image)	See the full Thistlethwaite Link Table (up to 11 crossings). Visit L7a5 at Knotilus!
	L7a5 is $7_{2}^{2}$ in the Rolfsen table of links.

Link Presentations

[edit Notes on L7a5's Link Presentations]

Planar diagram presentation	X8192 X10,3,11,4 X12,6,13,5 X14,11,7,12 X4,14,5,13 X2738 X6,9,1,10
Gauss code	{1, -6, 2, -5, 3, -7}, {6, -1, 7, -2, 4, -3, 5, -4}

A Braid Representative
A Morse Link Presentation

Polynomial invariants

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

Khovanov Homology

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

\   r    \    j   \ -5 -4 -3 -2 -1 0 1 2 χ 4               1 1 2             1   -1 0           2 1   1 -2         2 2     0 -4       2 1       1 -6     1 3         2 -8   1 1           0 -10   1             1 -12 1               -1

Integral Khovanov Homology (db, data source)

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

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.

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