8 17: Difference between revisions
(Resetting knot page to basic template.) |
No edit summary |
||
Line 1: | Line 1: | ||
<!-- --> |
|||
{{Template:Basic Knot Invariants|name=8_17}} |
|||
<!-- provide an anchor so we can return to the top of the page --> |
|||
<span id="top"></span> |
|||
<!-- this relies on transclusion for next and previous links --> |
|||
{{Knot Navigation Links|ext=gif}} |
|||
{| align=left |
|||
|- valign=top |
|||
|[[Image:{{PAGENAME}}.gif]] |
|||
|{{Rolfsen Knot Site Links|n=8|k=17|KnotilusURL=http://srankin.math.uwo.ca/cgi-bin/retrieve.cgi/1,-4,3,-6,5,-1,2,-3,6,-8,7,-5,4,-2,8,-7/goTop.html}} |
|||
|{{:{{PAGENAME}} Quick Notes}} |
|||
|} |
|||
<br style="clear:both" /> |
|||
{{:{{PAGENAME}} Further Notes and Views}} |
|||
{{Knot Presentations}} |
|||
{{3D Invariants}} |
|||
{{4D Invariants}} |
|||
{{Polynomial Invariants}} |
|||
{{Vassiliev Invariants}} |
|||
===[[Khovanov Homology]]=== |
|||
The coefficients of the monomials <math>t^rq^j</math> are shown, along with their alternating sums <math>\chi</math> (fixed <math>j</math>, alternation over <math>r</math>). The squares with <font class=HLYellow>yellow</font> highlighting are those on the "critical diagonals", where <math>j-2r=s+1</math> or <math>j-2r=s+1</math>, where <math>s=</math>{{Data:{{PAGENAME}}/Signature}} is the signature of {{PAGENAME}}. Nonzero entries off the critical diagonals (if any exist) are highlighted in <font class=HLRed>red</font>. |
|||
<center><table border=1> |
|||
<tr align=center> |
|||
<td width=15.3846%><table cellpadding=0 cellspacing=0> |
|||
<tr><td>\</td><td> </td><td>r</td></tr> |
|||
<tr><td> </td><td> \ </td><td> </td></tr> |
|||
<tr><td>j</td><td> </td><td>\</td></tr> |
|||
</table></td> |
|||
<td width=7.69231%>-4</td ><td width=7.69231%>-3</td ><td width=7.69231%>-2</td ><td width=7.69231%>-1</td ><td width=7.69231%>0</td ><td width=7.69231%>1</td ><td width=7.69231%>2</td ><td width=7.69231%>3</td ><td width=7.69231%>4</td ><td width=15.3846%>χ</td></tr> |
|||
<tr align=center><td>9</td><td> </td><td> </td><td> </td><td> </td><td> </td><td> </td><td> </td><td> </td><td bgcolor=yellow>1</td><td>1</td></tr> |
|||
<tr align=center><td>7</td><td> </td><td> </td><td> </td><td> </td><td> </td><td> </td><td> </td><td bgcolor=yellow>2</td><td bgcolor=yellow> </td><td>-2</td></tr> |
|||
<tr align=center><td>5</td><td> </td><td> </td><td> </td><td> </td><td> </td><td> </td><td bgcolor=yellow>3</td><td bgcolor=yellow>1</td><td> </td><td>2</td></tr> |
|||
<tr align=center><td>3</td><td> </td><td> </td><td> </td><td> </td><td> </td><td bgcolor=yellow>3</td><td bgcolor=yellow>2</td><td> </td><td> </td><td>-1</td></tr> |
|||
<tr align=center><td>1</td><td> </td><td> </td><td> </td><td> </td><td bgcolor=yellow>4</td><td bgcolor=yellow>3</td><td> </td><td> </td><td> </td><td>1</td></tr> |
|||
<tr align=center><td>-1</td><td> </td><td> </td><td> </td><td bgcolor=yellow>3</td><td bgcolor=yellow>4</td><td> </td><td> </td><td> </td><td> </td><td>1</td></tr> |
|||
<tr align=center><td>-3</td><td> </td><td> </td><td bgcolor=yellow>2</td><td bgcolor=yellow>3</td><td> </td><td> </td><td> </td><td> </td><td> </td><td>-1</td></tr> |
|||
<tr align=center><td>-5</td><td> </td><td bgcolor=yellow>1</td><td bgcolor=yellow>3</td><td> </td><td> </td><td> </td><td> </td><td> </td><td> </td><td>2</td></tr> |
|||
<tr align=center><td>-7</td><td bgcolor=yellow> </td><td bgcolor=yellow>2</td><td> </td><td> </td><td> </td><td> </td><td> </td><td> </td><td> </td><td>-2</td></tr> |
|||
<tr align=center><td>-9</td><td bgcolor=yellow>1</td><td> </td><td> </td><td> </td><td> </td><td> </td><td> </td><td> </td><td> </td><td>1</td></tr> |
|||
</table></center> |
|||
{{Computer Talk Header}} |
|||
<table> |
|||
<tr valign=top> |
|||
<td><pre style="color: blue; border: 0px; padding: 0em">In[1]:= </pre></td> |
|||
<td align=left><pre style="color: red; border: 0px; padding: 0em"><< KnotTheory`</pre></td> |
|||
</tr> |
|||
<tr valign=top><td colspan=2><pre style="border: 0px; padding: 0em">Loading KnotTheory` (version of August 17, 2005, 14:44:34)...</pre></td></tr> |
|||
<tr valign=top><td><pre style="color: blue; border: 0px; padding: 0em"><nowiki>In[2]:=</nowiki></pre></td><td><pre style="color: red; border: 0px; padding: 0em"><nowiki>Crossings[Knot[8, 17]]</nowiki></pre></td></tr> |
|||
<tr valign=top><td><pre style="color: blue; border: 0px; padding: 0em"><nowiki>Out[2]= </nowiki></pre></td><td><pre style="color: black; border: 0px; padding: 0em"><nowiki>8</nowiki></pre></td></tr> |
|||
<tr valign=top><td><pre style="color: blue; border: 0px; padding: 0em"><nowiki>In[3]:=</nowiki></pre></td><td><pre style="color: red; border: 0px; padding: 0em"><nowiki>PD[Knot[8, 17]]</nowiki></pre></td></tr> |
|||
<tr valign=top><td><pre style="color: blue; border: 0px; padding: 0em"><nowiki>Out[3]= </nowiki></pre></td><td><pre style="color: black; border: 0px; padding: 0em"><nowiki>PD[X[6, 2, 7, 1], X[14, 8, 15, 7], X[8, 3, 9, 4], X[2, 13, 3, 14], |
|||
X[12, 5, 13, 6], X[4, 9, 5, 10], X[16, 12, 1, 11], X[10, 16, 11, 15]]</nowiki></pre></td></tr> |
|||
<tr valign=top><td><pre style="color: blue; border: 0px; padding: 0em"><nowiki>In[4]:=</nowiki></pre></td><td><pre style="color: red; border: 0px; padding: 0em"><nowiki>GaussCode[Knot[8, 17]]</nowiki></pre></td></tr> |
|||
<tr valign=top><td><pre style="color: blue; border: 0px; padding: 0em"><nowiki>Out[4]= </nowiki></pre></td><td><pre style="color: black; border: 0px; padding: 0em"><nowiki>GaussCode[1, -4, 3, -6, 5, -1, 2, -3, 6, -8, 7, -5, 4, -2, 8, -7]</nowiki></pre></td></tr> |
|||
<tr valign=top><td><pre style="color: blue; border: 0px; padding: 0em"><nowiki>In[5]:=</nowiki></pre></td><td><pre style="color: red; border: 0px; padding: 0em"><nowiki>BR[Knot[8, 17]]</nowiki></pre></td></tr> |
|||
<tr valign=top><td><pre style="color: blue; border: 0px; padding: 0em"><nowiki>Out[5]= </nowiki></pre></td><td><pre style="color: black; border: 0px; padding: 0em"><nowiki>BR[3, {-1, -1, 2, -1, 2, -1, 2, 2}]</nowiki></pre></td></tr> |
|||
<tr valign=top><td><pre style="color: blue; border: 0px; padding: 0em"><nowiki>In[6]:=</nowiki></pre></td><td><pre style="color: red; border: 0px; padding: 0em"><nowiki>alex = Alexander[Knot[8, 17]][t]</nowiki></pre></td></tr> |
|||
<tr valign=top><td><pre style="color: blue; border: 0px; padding: 0em"><nowiki>Out[6]= </nowiki></pre></td><td><pre style="color: black; border: 0px; padding: 0em"><nowiki> -3 4 8 2 3 |
|||
11 - t + -- - - - 8 t + 4 t - t |
|||
2 t |
|||
t</nowiki></pre></td></tr> |
|||
<tr valign=top><td><pre style="color: blue; border: 0px; padding: 0em"><nowiki>In[7]:=</nowiki></pre></td><td><pre style="color: red; border: 0px; padding: 0em"><nowiki>Conway[Knot[8, 17]][z]</nowiki></pre></td></tr> |
|||
<tr valign=top><td><pre style="color: blue; border: 0px; padding: 0em"><nowiki>Out[7]= </nowiki></pre></td><td><pre style="color: black; border: 0px; padding: 0em"><nowiki> 2 4 6 |
|||
1 - z - 2 z - z</nowiki></pre></td></tr> |
|||
<tr valign=top><td><pre style="color: blue; border: 0px; padding: 0em"><nowiki>In[8]:=</nowiki></pre></td><td><pre style="color: red; border: 0px; padding: 0em"><nowiki>Select[AllKnots[], (alex === Alexander[#][t])&]</nowiki></pre></td></tr> |
|||
<tr valign=top><td><pre style="color: blue; border: 0px; padding: 0em"><nowiki>Out[8]= </nowiki></pre></td><td><pre style="color: black; border: 0px; padding: 0em"><nowiki>{Knot[8, 17], Knot[11, NonAlternating, 53]}</nowiki></pre></td></tr> |
|||
<tr valign=top><td><pre style="color: blue; border: 0px; padding: 0em"><nowiki>In[9]:=</nowiki></pre></td><td><pre style="color: red; border: 0px; padding: 0em"><nowiki>{KnotDet[Knot[8, 17]], KnotSignature[Knot[8, 17]]}</nowiki></pre></td></tr> |
|||
<tr valign=top><td><pre style="color: blue; border: 0px; padding: 0em"><nowiki>Out[9]= </nowiki></pre></td><td><pre style="color: black; border: 0px; padding: 0em"><nowiki>{37, 0}</nowiki></pre></td></tr> |
|||
<tr valign=top><td><pre style="color: blue; border: 0px; padding: 0em"><nowiki>In[10]:=</nowiki></pre></td><td><pre style="color: red; border: 0px; padding: 0em"><nowiki>J=Jones[Knot[8, 17]][q]</nowiki></pre></td></tr> |
|||
<tr valign=top><td><pre style="color: blue; border: 0px; padding: 0em"><nowiki>Out[10]= </nowiki></pre></td><td><pre style="color: black; border: 0px; padding: 0em"><nowiki> -4 3 5 6 2 3 4 |
|||
7 + q - -- + -- - - - 6 q + 5 q - 3 q + q |
|||
3 2 q |
|||
q q</nowiki></pre></td></tr> |
|||
<tr valign=top><td><pre style="color: blue; border: 0px; padding: 0em"><nowiki>In[11]:=</nowiki></pre></td><td><pre style="color: red; border: 0px; padding: 0em"><nowiki>Select[AllKnots[], (J === Jones[#][q] || (J /. q-> 1/q) === Jones[#][q])&]</nowiki></pre></td></tr> |
|||
<tr valign=top><td><pre style="color: blue; border: 0px; padding: 0em"><nowiki>Out[11]= </nowiki></pre></td><td><pre style="color: black; border: 0px; padding: 0em"><nowiki>{Knot[8, 17]}</nowiki></pre></td></tr> |
|||
<math>\textrm{Include}(\textrm{ColouredJonesM.mhtml})</math> |
|||
<tr valign=top><td><pre style="color: blue; border: 0px; padding: 0em"><nowiki>In[12]:=</nowiki></pre></td><td><pre style="color: red; border: 0px; padding: 0em"><nowiki>A2Invariant[Knot[8, 17]][q]</nowiki></pre></td></tr> |
|||
<tr valign=top><td><pre style="color: blue; border: 0px; padding: 0em"><nowiki>Out[12]= </nowiki></pre></td><td><pre style="color: black; border: 0px; padding: 0em"><nowiki> -12 -10 -8 -4 2 2 4 8 10 12 |
|||
-1 + q - q + q - q + -- + 2 q - q + q - q + q |
|||
2 |
|||
q</nowiki></pre></td></tr> |
|||
<tr valign=top><td><pre style="color: blue; border: 0px; padding: 0em"><nowiki>In[13]:=</nowiki></pre></td><td><pre style="color: red; border: 0px; padding: 0em"><nowiki>Kauffman[Knot[8, 17]][a, z]</nowiki></pre></td></tr> |
|||
<tr valign=top><td><pre style="color: blue; border: 0px; padding: 0em"><nowiki>Out[13]= </nowiki></pre></td><td><pre style="color: black; border: 0px; padding: 0em"><nowiki> 2 2 |
|||
-2 2 z 2 z 3 2 z 3 z 2 2 |
|||
-1 - a - a + -- + --- + 2 a z + a z + 8 z - -- + ---- + 3 a z - |
|||
3 a 4 2 |
|||
a a a |
|||
3 3 4 4 |
|||
4 2 4 z 6 z 3 3 3 4 z 6 z |
|||
a z - ---- - ---- - 6 a z - 4 a z - 14 z + -- - ---- - |
|||
3 a 4 2 |
|||
a a a |
|||
5 5 6 |
|||
2 4 4 4 3 z 2 z 5 3 5 6 4 z |
|||
6 a z + a z + ---- + ---- + 2 a z + 3 a z + 8 z + ---- + |
|||
3 a 2 |
|||
a a |
|||
7 |
|||
2 6 2 z 7 |
|||
4 a z + ---- + 2 a z |
|||
a</nowiki></pre></td></tr> |
|||
<tr valign=top><td><pre style="color: blue; border: 0px; padding: 0em"><nowiki>In[14]:=</nowiki></pre></td><td><pre style="color: red; border: 0px; padding: 0em"><nowiki>{Vassiliev[2][Knot[8, 17]], Vassiliev[3][Knot[8, 17]]}</nowiki></pre></td></tr> |
|||
<tr valign=top><td><pre style="color: blue; border: 0px; padding: 0em"><nowiki>Out[14]= </nowiki></pre></td><td><pre style="color: black; border: 0px; padding: 0em"><nowiki>{0, 0}</nowiki></pre></td></tr> |
|||
<tr valign=top><td><pre style="color: blue; border: 0px; padding: 0em"><nowiki>In[15]:=</nowiki></pre></td><td><pre style="color: red; border: 0px; padding: 0em"><nowiki>Kh[Knot[8, 17]][q, t]</nowiki></pre></td></tr> |
|||
<tr valign=top><td><pre style="color: blue; border: 0px; padding: 0em"><nowiki>Out[15]= </nowiki></pre></td><td><pre style="color: black; border: 0px; padding: 0em"><nowiki>4 1 2 1 3 2 3 3 |
|||
- + 4 q + ----- + ----- + ----- + ----- + ----- + ---- + --- + 3 q t + |
|||
q 9 4 7 3 5 3 5 2 3 2 3 q t |
|||
q t q t q t q t q t q t |
|||
3 3 2 5 2 5 3 7 3 9 4 |
|||
3 q t + 2 q t + 3 q t + q t + 2 q t + q t</nowiki></pre></td></tr> |
|||
</table> |
Revision as of 20:48, 27 August 2005
|
|
Visit 8 17's page at the Knot Server (KnotPlot driven, includes 3D interactive images!)
Visit 8 17's page at Knotilus! Visit 8 17's page at the original Knot Atlas! |
8 17 Quick Notes |
Knot presentations
Planar diagram presentation | X6271 X14,8,15,7 X8394 X2,13,3,14 X12,5,13,6 X4,9,5,10 X16,12,1,11 X10,16,11,15 |
Gauss code | 1, -4, 3, -6, 5, -1, 2, -3, 6, -8, 7, -5, 4, -2, 8, -7 |
Dowker-Thistlethwaite code | 6 8 12 14 4 16 2 10 |
Conway Notation | [.2.2] |
Three dimensional invariants
|
[edit Notes for 8 17's three dimensional invariants] 8_17 is the first negatively amphicheiral knot in the Rolfsen Table. Namely, it is equal to the inverse of its mirror, yet it is different from both its inverse and its mirror. |
Four dimensional invariants
|
Polynomial invariants
A1 Invariants.
Weight | Invariant |
---|---|
1 | |
2 | |
3 | |
4 | |
5 | |
6 |
A2 Invariants.
Weight | Invariant |
---|---|
1,0 | |
1,1 | |
2,0 |
A3 Invariants.
Weight | Invariant |
---|---|
0,1,0 | |
1,0,0 | |
1,0,1 |
A4 Invariants.
Weight | Invariant |
---|---|
0,1,0,0 | |
1,0,0,0 |
B2 Invariants.
Weight | Invariant |
---|---|
0,1 | |
1,0 |
D4 Invariants.
Weight | Invariant |
---|---|
1,0,0,0 |
G2 Invariants.
Weight | Invariant |
---|---|
1,0 |
.
KnotTheory`
, as shown in the (simulated) Mathematica session below. Your input (in red) is realistic; all else should have the same content as in a real mathematica session, but with different formatting. This Mathematica session is also available (albeit only for the knot 5_2) as the notebook PolynomialInvariantsSession.nb.
(The path below may be different on your system, and possibly also the KnotTheory` date)
In[1]:=
|
AppendTo[$Path, "C:/drorbn/projects/KAtlas/"];
<< KnotTheory`
|
Loading KnotTheory` version of August 31, 2006, 11:25:27.5625.
|
In[3]:=
|
K = Knot["8 17"];
|
In[4]:=
|
Alexander[K][t]
|
KnotTheory::loading: Loading precomputed data in PD4Knots`.
|
Out[4]=
|
In[5]:=
|
Conway[K][z]
|
Out[5]=
|
In[6]:=
|
Alexander[K, 2][t]
|
KnotTheory::credits: The program Alexander[K, r] to compute Alexander ideals was written by Jana Archibald at the University of Toronto in the summer of 2005.
|
Out[6]=
|
In[7]:=
|
{KnotDet[K], KnotSignature[K]}
|
Out[7]=
|
{ 37, 0 } |
In[8]:=
|
Jones[K][q]
|
KnotTheory::loading: Loading precomputed data in Jones4Knots`.
|
Out[8]=
|
In[9]:=
|
HOMFLYPT[K][a, z]
|
KnotTheory::credits: The HOMFLYPT program was written by Scott Morrison.
|
Out[9]=
|
In[10]:=
|
Kauffman[K][a, z]
|
KnotTheory::loading: Loading precomputed data in Kauffman4Knots`.
|
Out[10]=
|
Vassiliev invariants
V2 and V3: | (-1, 0) |
V2,1 through V6,9: |
|
V2,1 through V6,9 were provided by Petr Dunin-Barkowski <barkovs@itep.ru>, Andrey Smirnov <asmirnov@itep.ru>, and Alexei Sleptsov <sleptsov@itep.ru> and uploaded on October 2010 by User:Drorbn. Note that they are normalized differently than V2 and V3.
Khovanov Homology
The coefficients of the monomials are shown, along with their alternating sums (fixed , alternation over ). The squares with yellow highlighting are those on the "critical diagonals", where or , where 0 is the signature of 8 17. Nonzero entries off the critical diagonals (if any exist) are highlighted in red.
|
-4 | -3 | -2 | -1 | 0 | 1 | 2 | 3 | 4 | χ | |||||||||
9 | 1 | 1 | |||||||||||||||||
7 | 2 | -2 | |||||||||||||||||
5 | 3 | 1 | 2 | ||||||||||||||||
3 | 3 | 2 | -1 | ||||||||||||||||
1 | 4 | 3 | 1 | ||||||||||||||||
-1 | 3 | 4 | 1 | ||||||||||||||||
-3 | 2 | 3 | -1 | ||||||||||||||||
-5 | 1 | 3 | 2 | ||||||||||||||||
-7 | 2 | -2 | |||||||||||||||||
-9 | 1 | 1 |
Computer Talk
Much of the above data can be recomputed by Mathematica using the package KnotTheory`
. See A Sample KnotTheory` Session.
In[1]:= |
<< KnotTheory` |
Loading KnotTheory` (version of August 17, 2005, 14:44:34)... | |
In[2]:= | Crossings[Knot[8, 17]] |
Out[2]= | 8 |
In[3]:= | PD[Knot[8, 17]] |
Out[3]= | PD[X[6, 2, 7, 1], X[14, 8, 15, 7], X[8, 3, 9, 4], X[2, 13, 3, 14], X[12, 5, 13, 6], X[4, 9, 5, 10], X[16, 12, 1, 11], X[10, 16, 11, 15]] |
In[4]:= | GaussCode[Knot[8, 17]] |
Out[4]= | GaussCode[1, -4, 3, -6, 5, -1, 2, -3, 6, -8, 7, -5, 4, -2, 8, -7] |
In[5]:= | BR[Knot[8, 17]] |
Out[5]= | BR[3, {-1, -1, 2, -1, 2, -1, 2, 2}] |
In[6]:= | alex = Alexander[Knot[8, 17]][t] |
Out[6]= | -3 4 8 2 3 |
In[7]:= | Conway[Knot[8, 17]][z] |
Out[7]= | 2 4 6 1 - z - 2 z - z |
In[8]:= | Select[AllKnots[], (alex === Alexander[#][t])&] |
Out[8]= | {Knot[8, 17], Knot[11, NonAlternating, 53]} |
In[9]:= | {KnotDet[Knot[8, 17]], KnotSignature[Knot[8, 17]]} |
Out[9]= | {37, 0} |
In[10]:= | J=Jones[Knot[8, 17]][q] |
Out[10]= | -4 3 5 6 2 3 4 |
In[11]:= | Select[AllKnots[], (J === Jones[#][q] || (J /. q-> 1/q) === Jones[#][q])&] |
Out[11]= | {Knot[8, 17]} |
In[12]:= | A2Invariant[Knot[8, 17]][q] |
Out[12]= | -12 -10 -8 -4 2 2 4 8 10 12 |
In[13]:= | Kauffman[Knot[8, 17]][a, z] |
Out[13]= | 2 2-2 2 z 2 z 3 2 z 3 z 2 2 |
In[14]:= | {Vassiliev[2][Knot[8, 17]], Vassiliev[3][Knot[8, 17]]} |
Out[14]= | {0, 0} |
In[15]:= | Kh[Knot[8, 17]][q, t] |
Out[15]= | 4 1 2 1 3 2 3 3 |