20/09/05 08:20:50.35 YJxrx+O5.net
>>153
つづき
P12
2.3 Sheaf cohomology
One can define cohomology groups with coefficients in sheaves, just as one can define cohomology with coefficients in R and Z. Such cohomology groups are called sheaf cohomology.
Sheaf cohomology groups commonly arise in physics when counting vertex operators in string
compactifications. See for example [17] for a discussion of how sheaf cohomology counts spectra in heterotic compactifications, and [18] for a discussion of how sheaf cohomology counts
spectra in