10 48

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10 47.gif

10_47

10 49.gif

10_49

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10 48 Quick Notes


10 48 Further Notes and Views

Knot presentations

Planar diagram presentation X6271 X8493 X14,6,15,5 X20,15,1,16 X16,9,17,10 X18,11,19,12 X10,17,11,18 X12,19,13,20 X2837 X4,14,5,13
Gauss code 1, -9, 2, -10, 3, -1, 9, -2, 5, -7, 6, -8, 10, -3, 4, -5, 7, -6, 8, -4
Dowker-Thistlethwaite code 6 8 14 2 16 18 4 20 10 12
Conway Notation [41,3,2]

Three dimensional invariants

Symmetry type Reversible
Unknotting number 2
3-genus 4
Bridge index 3
Super bridge index Missing
Nakanishi index 1
Maximal Thurston-Bennequin number [-6][-6]
Hyperbolic Volume 10.3789
A-Polynomial See Data:10 48/A-polynomial

[edit Notes for 10 48's three dimensional invariants]

Four dimensional invariants

Smooth 4 genus
Topological 4 genus
Concordance genus
Rasmussen s-Invariant 0

[edit Notes for 10 48's four dimensional invariants]

Polynomial invariants

Alexander polynomial
Conway polynomial
2nd Alexander ideal (db, data sources)
Determinant and Signature { 49, 0 }
Jones polynomial
HOMFLY-PT polynomial (db, data sources)
Kauffman polynomial (db, data sources)
The A2 invariant
The G2 invariant

Vassiliev invariants

V2 and V3: (4, 0)
V2,1 through V6,9:
V2,1 V3,1 V4,1 V4,2 V4,3 V5,1 V5,2 V5,3 V5,4 V6,1 V6,2 V6,3 V6,4 V6,5 V6,6 V6,7 V6,8 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 Failed to parse (SVG (MathML can be enabled via browser plugin): Invalid response ("Math extension cannot connect to Restbase.") from server "https://wikimedia.org/api/rest_v1/":): {\displaystyle \chi} (fixed , alternation over ). The squares with yellow highlighting are those on the "critical diagonals", where or , where 0 is the signature of 10 48. Nonzero entries off the critical diagonals (if any exist) are highlighted in red.   
\ r
  \  
j \
-5-4-3-2-1012345χ
11          1-1
9         1 1
7        31 -2
5       31  2
3      43   -1
1     53    2
-1    35     2
-3   34      -1
-5  13       2
-7 13        -2
-9 1         1
-111          -1
Integral Khovanov Homology

(db, data source)

  

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[10, 48]]
Out[2]=  
10
In[3]:=
PD[Knot[10, 48]]
Out[3]=  
PD[X[6, 2, 7, 1], X[8, 4, 9, 3], X[14, 6, 15, 5], X[20, 15, 1, 16], 
 X[16, 9, 17, 10], X[18, 11, 19, 12], X[10, 17, 11, 18], 

X[12, 19, 13, 20], X[2, 8, 3, 7], X[4, 14, 5, 13]]
In[4]:=
GaussCode[Knot[10, 48]]
Out[4]=  
GaussCode[1, -9, 2, -10, 3, -1, 9, -2, 5, -7, 6, -8, 10, -3, 4, -5, 7, 
  -6, 8, -4]
In[5]:=
BR[Knot[10, 48]]
Out[5]=  
BR[3, {-1, -1, -1, -1, 2, 2, -1, 2, 2, 2}]
In[6]:=
alex = Alexander[Knot[10, 48]][t]
Out[6]=  
      -4   3    6    9            2      3    4

11 + t - -- + -- - - - 9 t + 6 t - 3 t + t

           3    2   t
t t
In[7]:=
Conway[Knot[10, 48]][z]
Out[7]=  
       2      4      6    8
1 + 4 z  + 8 z  + 5 z  + z
In[8]:=
Select[AllKnots[], (alex === Alexander[#][t])&]
Out[8]=  
{Knot[10, 48]}
In[9]:=
{KnotDet[Knot[10, 48]], KnotSignature[Knot[10, 48]]}
Out[9]=  
{49, 0}
In[10]:=
J=Jones[Knot[10, 48]][q]
Out[10]=  
     -5   2    4    6    7            2      3      4    5

9 - q + -- - -- + -- - - - 7 q + 6 q - 4 q + 2 q - q

          4    3    2   q
q q q
In[11]:=
Select[AllKnots[], (J === Jones[#][q] || (J /. q-> 1/q) === Jones[#][q])&]
Out[11]=  
{Knot[10, 48]}
In[12]:=
A2Invariant[Knot[10, 48]][q]
Out[12]=  
     -14    2    4       2      10    14

1 - q - --- + -- + 4 q - 2 q - q

           10    2
q q
In[13]:=
Kauffman[Knot[10, 48]][a, z]
Out[13]=  
                                                           2       2
   4       2   z    3 z   9 z              5         2   z    13 z

9 + -- + 4 a + -- - --- - --- - 7 a z + 2 a z - 27 z + -- - ----- -

    2           5    3     a                              4     2
   a           a    a                                    a     a

                         3      3       3
     2  2      4  2   3 z    8 z    21 z          3    3  3
 11 a  z  + 2 a  z  - ---- + ---- + ----- + 12 a z  - a  z  - 
                        5      3      a
                       a      a

                      4       4                        5      5
    5  3       4   5 z    18 z       2  4      4  4   z    9 z
 3 a  z  + 37 z  - ---- + ----- + 9 a  z  - 5 a  z  + -- - ---- - 
                     4      2                          5     3
                    a      a                          a     a

     5                                         6       6
 11 z         5      3  5    5  5       6   2 z    11 z       2  6
 ----- - 5 a z  - 3 a  z  + a  z  - 20 z  + ---- - ----- - 5 a  z  + 
   a                                          4      2
                                             a      a

              7    7                       8              9
    4  6   3 z    z       3  7      8   3 z       2  8   z       9
 2 a  z  + ---- + -- + 2 a  z  + 5 z  + ---- + 2 a  z  + -- + a z
             3    a                       2              a
a a
In[14]:=
{Vassiliev[2][Knot[10, 48]], Vassiliev[3][Knot[10, 48]]}
Out[14]=  
{0, 0}
In[15]:=
Kh[Knot[10, 48]][q, t]
Out[15]=  
5           1        1       1       3       1       3       3

- + 5 q + ------ + ----- + ----- + ----- + ----- + ----- + ----- + q 11 5 9 4 7 4 7 3 5 3 5 2 3 2

         q   t    q  t    q  t    q  t    q  t    q  t    q  t

  4      3               3        3  2      5  2    5  3      7  3
 ---- + --- + 3 q t + 4 q  t + 3 q  t  + 3 q  t  + q  t  + 3 q  t  + 
  3     q t
 q  t

  7  4    9  4    11  5
q t + q t + q t