ℚ-gorenstein deformations of nonnormal surfaces
Date
2009Source
American Journal of MathematicsVolume
131Issue
1Pages
171-193Google Scholar check
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Let Δ C H be the germ of a nonnormal surface along a proper curve with smooth components such that the high index points of H are semi-log-terminal and the Gorenstein singular points are semi-log-canonical of embedding dimension at most 4. We describe the sheaf T1 qG(H) of ℚ-Gorenstein deformations of H and we obtain criteria for Δ C H to have ℚ-Gorenstein terminal smoothings.