next | previous | forward | backward | up | top | index | toc | Macaulay2 website
K3Carpets :: resonanceDet

resonanceDet -- compute the resonance determinant of the crucial constant strand of a degenerate K3 X_e(a,a)

Synopsis

Description

We compute the minimal resolution F of degenerate K3 X_e(a,a) over ZZ[e_1,e_2] where deg e_i =i and the variables x_0,..x_a,y_0..y_b have degrees deg x_i=i+1 and deg y_i=1. The equations of X_e(a,b) are homogeneous with respect to this grading. Viewed as a resolution over QQ(e_1,e_2), this resolution is non-minimal and carries further gradings. We decompose the crucial map of the a-th strand into blocks, compute their determinants, and factor the product.

i1 : a=4

o1 = 4
i2 : (d1,d2)=resonanceDet(a)
 -- 0.0272893 seconds elapsed
 -- 0.000029896 seconds elapsed
 -- 0.000076318 seconds elapsed
 -- 0.000064467 seconds elapsed
 -- 0.000122213 seconds elapsed
 -- 0.000131391 seconds elapsed
 -- 0.000128895 seconds elapsed
 -- 0.000036704 seconds elapsed
 -- 0.000098548 seconds elapsed
 -- 0.000122903 seconds elapsed
 -- 0.000135934 seconds elapsed
 -- 0.000130202 seconds elapsed
 -- 0.000084973 seconds elapsed
 -- 0.000106465 seconds elapsed
 -- 0.000061522 seconds elapsed
 -- 0.000061272 seconds elapsed
 -- 0.000020395 seconds elapsed
 -- 0.000099098 seconds elapsed
 -- 0.000020134 seconds elapsed
(number of blocks= , 18)
(size of the matrices, Tally{1 => 4})
                             2 => 6
                             3 => 2
                             4 => 6
       0 1
total: 1 1
    7: 1 1
(e )(-1)
  1
       0 1
total: 2 2
    7: 2 .
    8: . 2
    2
(e ) (e )(-1)
  1    2
       0 1
total: 2 2
    7: 2 .
    8: . .
    9: . 2
    2    2
(e ) (e )
  1    2
       0 1
total: 3 3
    7: 2 .
    8: 1 .
    9: . 1
   10: . 2
    2    4
(e ) (e ) (-3)
  1    2
       0 1
total: 4 4
    7: 1 .
    8: 1 .
    9: 2 2
   10: . 1
   11: . 1
    2    4
(e ) (e ) (3)
  1    2
       0 1
total: 4 4
    8: 1 .
    9: 2 1
   10: 1 2
   11: . 1
    2    3
(e ) (e ) (3)
  1    2
       0 1
total: 1 1
    9: 1 1
(e )(-1)
  1
       0 1
total: 2 2
    9: 1 1
   10: 1 1
    2
(e )
  1
       0 1
total: 4 4
    9: 2 1
   10: 1 1
   11: 1 2
    2    2
(e ) (e ) (-1)
  1    2
       0 1
total: 4 4
    9: 1 .
   10: 2 1
   11: 1 2
   12: . 1
    2    3
(e ) (e ) (3)
  1    2
       0 1
total: 4 4
    9: 1 .
   10: 1 .
   11: 2 2
   12: . 1
   13: . 1
    2    4
(e ) (e ) (3)
  1    2
       0 1
total: 4 4
    9: 2 1
   10: 1 1
   11: 1 2
    2    2
(e ) (e ) (-1)
  1    2
       0 1
total: 3 3
   10: 2 .
   11: 1 .
   12: . 1
   13: . 2
    2    4
(e ) (e ) (3)
  1    2
       0 1
total: 2 2
   10: 1 1
   11: 1 1
    2
(e )
  1
       0 1
total: 2 2
   11: 2 .
   12: . .
   13: . 2
    2    2
(e ) (e )
  1    2
       0 1
total: 1 1
   11: 1 1
(e )
  1
       0 1
total: 2 2
   12: 2 .
   13: . 2
    2
(e ) (e )(-1)
  1    2
       0 1
total: 1 1
   13: 1 1
(e )
  1

       6      32    32
o2 = (3 , (e )  (e )  )
            1     2

o2 : Sequence

See also

Ways to use resonanceDet :

For the programmer

The object resonanceDet is a method function.