arXiv subjects

Stefan Schroeer

Publications and source records attributed to Stefan Schroeer.

38 records · Page 3Linked to original sources

arXiv1999

On contractible curves on normal surfaces

We characterize contractible curves on proper normal algebraic surfaces in terms of complementary Weil divisors. Using this we generalize the classical criteria of Castelnuovo and Artin. As application we derive a finiteness result on homogeneous spectra defined by Weil divisors on surfaces.

math.AG↗

arXiv1999

On non-projective normal surfaces

We construct examples of non-projective normal proper algebraic surfaces and discuss the pathological behaviour of their Neron-Severi group. Our surfaces are birational to the product of a projective line and a curve of higher genus.

math.AG↗