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Ursprung des liturgischen Spiels
(1979) 
A note on the postulation of maximal rank curves
(1987)Let s be the lowest degree of a surface containing a maximal rank curve Y. We want to compare the dimension of the space of the surfaces of degree s containing Y with the dimension of the space of the surfaces of degree ... 
Arithmetically normal sheaves
(1987)We rind the upper bound for the third Chem class of a curvilinear sheaf with seminatural cohomology, and we determine all the triples of Chem classes for which there exist two different kinds of seminatural cohomology. ... 
The structure of an even liaison class
(1989)We describe a structure called the LazarsfeldRao property for even liaison classes in projective space. This property holds for many even liaison classes of curves in P3. We give a procedure for showing that an even ... 
Deformations of Arithmetically CohenMacaulay subvarieties of Pn
(1989)We show that every arithmetically CohenMacaulay twocodimensional subscheme ofPn can be deformed to a reduced union of twocodimensional linear subvarieties. This problem (classical for curves with the name of Zeuthen ... 
Irreducible families of curves with fixed cohomology
(1989)One of the classical ways for studying the problem of the classification of curves in the projective space was the investigation of the irreducible families of curves, and this approach led to the notion of Hilbert scheme. ... 
Numerical invariants of rank2 arithmetically buchsbaum sheaves
(1989)We study rank2 reflexive sheaves on P3 whose sections are Buchsbaum curves, giving vanishing theorems for the cohomology and bounds and gaps for the existence range of their Chern classes. These results are applied to ... 
Deficiency modules and specializations
(1990)Given a family of curves in the projective space we study how their deficiency modules can change. This has a geometrical translation in the problem of determining how the liaison class of a flat family of curves can change. ... 
Construction of families of curves from finite length graded modules
(1990)We construct particular families of projective space curves starting from finite length graded modules, exhibiting several phenomena of specializations. The main tool is the Rao construction via a free resolution of the module. 
The variety of module structures
(1990)Introduction. In this paper we study how is "structured" the set of curves of the projective space having assigned dimensions for the cohomology groups Hi (P3, Jx (t)). In particular, we show that almost always this locally ... 
Fach oder Disziplin: Kommunikationsverhältnisse der Erziehungswissenschaft in Frankreich und Deutschland
(1990)Fragen ihrer disziplinären Identität sind in der Erziehungswissenschaft nicht nur in Deutschland ein intensiv diskutiertes Problem. Der Artikel geht diesem Problem mit empirischquantifiziertenden Verfahren und gestützt ... 
The LazarsfeldRao problem for liaison classes of twocodimensional subschemes of Pn
(1991)We show how to use all the machinery of liaison techniques for the study of twocodimensional subschemes of a smooth arithmetically Gorenstein subscheme of Pn.