- SymmetricDivisorM0nbar -- negate a symmetric divisor

Synopsis

Operator: -
Usage:

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

Description

Let $Pic(\bar{M}_{0,n})_Q^{S_n}$ denote the vector space of $S_n$-invariant divisors with rational coefficients. Here, given an $S_n$ symmetric $Q$-divisor $D$ on $\bar{M}_{0,n}$, 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

Ways to use this method: