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math.AG2000
What is missing in canonical models for proper normal algebraic surfaces?
Stefan Schroeer
Smooth surfaces have finitely generated canonical rings and projective canonical models. For normal surfaces, however, the graded ring of multicanonical sections is possibly nonnoe…
math.AG2000★ 1 cited
Logarithmic deformations of normal crossing Enriques surfaces in characteristic two
Stefan Schroeer
Working in characteristic two, I classify nonsmooth Enriques surfaces with normal crossing singularities. Using Kato's theory of logarithmic structures, I show that such surfaces a…