- SymmetricDivisorM0nbar -- negate a symmetric divisor

Synopsis

Usage:

-D
Operator: -
Inputs:
- D, an instance of the type SymmetricDivisorM0nbar
Outputs:
- E, an instance of the type SymmetricDivisorM0nbar

Description

Let Pic(M_0,n)_Q^S_n denote the vector space of S_n-invariant divisors with rational coefficients. Here, given an S_n symmetric Q-divisor D on M_0,n, the function returns -D.

i1 : D=symmetricDivisorM0nbar(6,{2,3})

o1 = 2*B  + 3*B
        2      3

o1 : S_6-symmetric divisor on M-0-6-bar

i2 : E=-D

o2 = - 2*B  - 3*B
          2      3

o2 : S_6-symmetric divisor on M-0-6-bar