# symmetricCurveDotDivisorM0nbar -- the intersection number of a symmetric F-curve C with the symmetric divisor D

## Synopsis

• Usage:
symmetricCurveDotDivisorM0nbar({3,1,1,1},D)
• Inputs:
• Outputs:
• k,

## Description

This function implements the basic formula of [KM] Corollary 4.4 for intersecting an $S_n$-symmetric F curve with an $S_n$ symmetric divisor on $\bar{M}_{0,n}$.

 i1 : D=symmetricDivisorM0nbar(6,2*B_2+B_3) o1 = 2*B + B 2 3 o1 : S_6-symmetric divisor on M-0-6-bar i2 : symmetricCurveDotDivisorM0nbar({3,1,1,1},D) o2 = 5 i3 : E=symmetricDivisorM0nbar(6,B_2+3*B_3) o3 = B + 3*B 2 3 o3 : S_6-symmetric divisor on M-0-6-bar i4 : symmetricCurveDotDivisorM0nbar({3,1,1,1},E) o4 = 0

## Ways to use symmetricCurveDotDivisorM0nbar :

• "symmetricCurveDotDivisorM0nbar(List,SymmetricDivisorM0nbar)"

## For the programmer

The object symmetricCurveDotDivisorM0nbar is .