# ch -- Chern character of the Hodge bundle

• Usage:
ch_a
• Inputs:
• Outputs:

## Description

This is an element in the ring created by hodgeRing. It is the $a$-th graded part of the Chern character of the Hodge bundle on ${\bar M}_{g,n}$.

## Examples

Here is a simple example which calculates $\int_{{\bar M}_{1,1}} ch_1$.

 i1 : R = hodgeRing (1, 1); i2 : ch_1 o2 = ch 1 o2 : R i3 : integral(1, 1, ch_1) warning: clearing value of symbol tempCh to allow access to subscripted variables based on it : debug with expression debug 1257 or with command line option --debug 1257 1 o3 = -- 24 o3 : R