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math.AG2003
Equivariant classification of Gorenstein open log del Pezzo surfaces with finite group actions
Masayoshi Miyanishi, De-Qi Zhang
We classify equivariantly Gorenstein log del Pezzo surfaces with boundaries at infinity and with finite group actions such that the quotient surface modulo the finite group has Pic…
math.AG2003
The determination of integral closures and geometric applications
Sheng-Li Tan, De-Qi Zhang
We express explicitly the integral closures of some ring extensions; this is done for all Bring-Jerrard extensions of any degree as well as for all general extensions of degree < 6…