# symmetricDivisorM0nbar -- create a symmetric divisor on the moduli space of stable pointed genus 0 curves

## Description

A symmetric divisor on $\bar{M}_{0,n}$ may be created in either one of two ways. The user may either enter the number of marked points $n$ and a linear polynomial in the standard basis classes $B_i$, or enter $n$ and a list of the coefficients of $D$ in the standard basis. Both usages are demonstrated in the example below.

 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=symmetricDivisorM0nbar(6,2*B_2+3*B_3) o2 = 2*B + 3*B 2 3 o2 : S_6-symmetric divisor on M-0-6-bar i3 : D==E o3 = true

## Ways to use symmetricDivisorM0nbar :

• "symmetricDivisorM0nbar(ZZ,Expression)"
• "symmetricDivisorM0nbar(ZZ,IndexedVariable)"
• "symmetricDivisorM0nbar(ZZ,List)"

## For the programmer

The object symmetricDivisorM0nbar is .