# euler(CoherentSheaf) -- Euler characteristic of coherent sheaf

## Synopsis

• Function: euler
• Usage:
euler F
• Inputs:
• F,
• Outputs:
• an integer, the Euler characteristic of the cohomology of the sheaf

## Description

The command returns chi(F) the Euler characteristic of the sheaf F i.e. the alternated sum of the dimensions of its cohomology groups