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euler(CoherentSheaf)
euler(CoherentSheaf)  Euler characteristic of coherent sheaf
Synopsis
Function:
euler
Usage:
euler F
Inputs:
F
,
a
coherent sheaf
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
See also
eulers(CoherentSheaf)
 list the sectional Euler characteristics
genus
 arithmetic genus