On the Hilbert scheme of Palatini threefolds.
Semipolarized nonruled surfaces with sectional genus two.
Trigonal Hyperplane Sections of Projective Surfaces.
Varieties whose hyperplane section are bundles
On the structure of linked 3-folds.
The structure of 3-folds in P which are generally linked via a complete intersection (f,f,f) to 3-folds in P of degree d ≤ 5 is determined. We also give three new examples of smooth 3-folds in P of degree 11 and genus 9. These examples are obtained via liaison. The first two are 3-folds linked via a complete intersection (2,3,3) to 3-folds in P of degree 7: (i) the hyperquadric fibration over P and (ii) the scroll over P. The third example is Pfaffian linked to a 3-dimensional quadric in P.
Boundedness for codimension two submanifolds of quadrics.
It is proved that there are only finitely many families of codimension two subvarieties not of general type in Q6.
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