Given a symmetric divisor D on M0,n, this function returns the list of symmetric F curves C such that D . C=0.
Here is an example from the paper [AGSS]: When n is even, the divisor Dn1,n/2 is zero on even F-curves and 1 on odd F-curves. (Here the parity of Fa,b,c,d is defined to be the parity of the product abcd.) In the calculations below, we check this claim for n=8.
i1 : D=symmetricDivisorM0nbar(8,3*B_2+2*B_3+4*B_4) o1 = 3*B + 2*B + 4*B 2 3 4 o1 : S_8-symmetric divisor on M-0-8-bar |
i2 : killsCurves(D) o2 = {{4, 2, 1, 1}, {3, 2, 2, 1}, {2, 2, 2, 2}} o2 : List |