T(29,2)
[[Image:T(14,3).{{{ext}}}|80px|link=T(14,3)]] |
[[Image:T(31,2).{{{ext}}}|80px|link=T(31,2)]] |
Visit T(29,2)'s page at Knotilus!
Visit T(29,2)'s page at the original Knot Atlas! |
T(29,2) Further Notes and Views
Knot presentations
Planar diagram presentation | X19,49,20,48 X49,21,50,20 X21,51,22,50 X51,23,52,22 X23,53,24,52 X53,25,54,24 X25,55,26,54 X55,27,56,26 X27,57,28,56 X57,29,58,28 X29,1,30,58 X1,31,2,30 X31,3,32,2 X3,33,4,32 X33,5,34,4 X5,35,6,34 X35,7,36,6 X7,37,8,36 X37,9,38,8 X9,39,10,38 X39,11,40,10 X11,41,12,40 X41,13,42,12 X13,43,14,42 X43,15,44,14 X15,45,16,44 X45,17,46,16 X17,47,18,46 X47,19,48,18 |
Gauss code | {-12, 13, -14, 15, -16, 17, -18, 19, -20, 21, -22, 23, -24, 25, -26, 27, -28, 29, -1, 2, -3, 4, -5, 6, -7, 8, -9, 10, -11, 12, -13, 14, -15, 16, -17, 18, -19, 20, -21, 22, -23, 24, -25, 26, -27, 28, -29, 1, -2, 3, -4, 5, -6, 7, -8, 9, -10, 11} |
Dowker-Thistlethwaite code | 30 32 34 36 38 40 42 44 46 48 50 52 54 56 58 2 4 6 8 10 12 14 16 18 20 22 24 26 28 |
Polynomial invariants
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["T(29,2)"];
|
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]=
|
{ 29, 28 } |
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 | {0, 1015} |
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 28 is the signature of T(29,2). Nonzero entries off the critical diagonals (if any exist) are highlighted in red.
|
0 | 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 | 10 | 11 | 12 | 13 | 14 | 15 | 16 | 17 | 18 | 19 | 20 | 21 | 22 | 23 | 24 | 25 | 26 | 27 | 28 | 29 | χ | |||||||||
87 | 1 | -1 | ||||||||||||||||||||||||||||||||||||||
85 | 0 | |||||||||||||||||||||||||||||||||||||||
83 | 1 | 1 | 0 | |||||||||||||||||||||||||||||||||||||
81 | 0 | |||||||||||||||||||||||||||||||||||||||
79 | 1 | 1 | 0 | |||||||||||||||||||||||||||||||||||||
77 | 0 | |||||||||||||||||||||||||||||||||||||||
75 | 1 | 1 | 0 | |||||||||||||||||||||||||||||||||||||
73 | 0 | |||||||||||||||||||||||||||||||||||||||
71 | 1 | 1 | 0 | |||||||||||||||||||||||||||||||||||||
69 | 0 | |||||||||||||||||||||||||||||||||||||||
67 | 1 | 1 | 0 | |||||||||||||||||||||||||||||||||||||
65 | 0 | |||||||||||||||||||||||||||||||||||||||
63 | 1 | 1 | 0 | |||||||||||||||||||||||||||||||||||||
61 | 0 | |||||||||||||||||||||||||||||||||||||||
59 | 1 | 1 | 0 | |||||||||||||||||||||||||||||||||||||
57 | 0 | |||||||||||||||||||||||||||||||||||||||
55 | 1 | 1 | 0 | |||||||||||||||||||||||||||||||||||||
53 | 0 | |||||||||||||||||||||||||||||||||||||||
51 | 1 | 1 | 0 | |||||||||||||||||||||||||||||||||||||
49 | 0 | |||||||||||||||||||||||||||||||||||||||
47 | 1 | 1 | 0 | |||||||||||||||||||||||||||||||||||||
45 | 0 | |||||||||||||||||||||||||||||||||||||||
43 | 1 | 1 | 0 | |||||||||||||||||||||||||||||||||||||
41 | 0 | |||||||||||||||||||||||||||||||||||||||
39 | 1 | 1 | 0 | |||||||||||||||||||||||||||||||||||||
37 | 0 | |||||||||||||||||||||||||||||||||||||||
35 | 1 | 1 | 0 | |||||||||||||||||||||||||||||||||||||
33 | 0 | |||||||||||||||||||||||||||||||||||||||
31 | 1 | 1 | ||||||||||||||||||||||||||||||||||||||
29 | 1 | 1 | ||||||||||||||||||||||||||||||||||||||
27 | 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 19, 2005, 13:11:25)... | |
In[2]:= | Crossings[TorusKnot[29, 2]] |
Out[2]= | 29 |
In[3]:= | PD[TorusKnot[29, 2]] |
Out[3]= | PD[X[19, 49, 20, 48], X[49, 21, 50, 20], X[21, 51, 22, 50],X[51, 23, 52, 22], X[23, 53, 24, 52], X[53, 25, 54, 24], X[25, 55, 26, 54], X[55, 27, 56, 26], X[27, 57, 28, 56], X[57, 29, 58, 28], X[29, 1, 30, 58], X[1, 31, 2, 30], X[31, 3, 32, 2], X[3, 33, 4, 32], X[33, 5, 34, 4], X[5, 35, 6, 34], X[35, 7, 36, 6], X[7, 37, 8, 36], X[37, 9, 38, 8], X[9, 39, 10, 38], X[39, 11, 40, 10], X[11, 41, 12, 40], X[41, 13, 42, 12], X[13, 43, 14, 42], X[43, 15, 44, 14], X[15, 45, 16, 44],X[45, 17, 46, 16], X[17, 47, 18, 46], X[47, 19, 48, 18]] |
In[4]:= | GaussCode[TorusKnot[29, 2]] |
Out[4]= | GaussCode[-12, 13, -14, 15, -16, 17, -18, 19, -20, 21, -22, 23, -24,25, -26, 27, -28, 29, -1, 2, -3, 4, -5, 6, -7, 8, -9, 10, -11, 12, -13, 14, -15, 16, -17, 18, -19, 20, -21, 22, -23, 24, -25, 26, -27,28, -29, 1, -2, 3, -4, 5, -6, 7, -8, 9, -10, 11] |
In[5]:= | BR[TorusKnot[29, 2]] |
Out[5]= | BR[2, {1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1}] |
In[6]:= | alex = Alexander[TorusKnot[29, 2]][t] |
Out[6]= | -14 -13 -12 -11 -10 -9 -8 -7 -6 -5 |
In[7]:= | Conway[TorusKnot[29, 2]][z] |
Out[7]= | 2 4 6 8 10 12 |
In[8]:= | Select[AllKnots[], (alex === Alexander[#][t])&] |
Out[8]= | {} |
In[9]:= | {KnotDet[TorusKnot[29, 2]], KnotSignature[TorusKnot[29, 2]]} |
Out[9]= | {29, 28} |
In[10]:= | J=Jones[TorusKnot[29, 2]][q] |
Out[10]= | 14 16 17 18 19 20 21 22 23 24 25 26 |
In[11]:= | Select[AllKnots[], (J === Jones[#][q] || (J /. q-> 1/q) === Jones[#][q])&] |
Out[11]= | {} |
In[12]:= | A2Invariant[TorusKnot[29, 2]][q] |
Out[12]= | NotAvailable |
In[13]:= | Kauffman[TorusKnot[29, 2]][a, z] |
Out[13]= | NotAvailable |
In[14]:= | {Vassiliev[2][TorusKnot[29, 2]], Vassiliev[3][TorusKnot[29, 2]]} |
Out[14]= | {0, 1015} |
In[15]:= | Kh[TorusKnot[29, 2]][q, t] |
Out[15]= | 27 29 31 2 35 3 35 4 39 5 39 6 43 7 |