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math.AG2012
Torsion-free Sheaves and ACM Schemes
S. Greco, R. Notari, M. L. Spreafico
In this paper we study short exact sequences $ 0 \to \mathcal P \to \mathcal N \to \ii_D(k) \to 0 $ with torsion--free sheaves and closed projectiv…
math.AG2008
Doubling rational normal curves
Roberto Notari, Ignacio Ojeda, Maria Luisa Spreafico
In this paper, we study double structures supported on rational normal curves. After recalling the general construction of double structures supported on a smooth curve described i…
math.AG2003★ 1 cited
The Hilbert scheme of degree two curves and certain ropes
Uwe Nagel, Roberto Notari, Maria Luisa Spreafico
We study families of ropes of any codimension that are supported on lines. In particular, this includes all non-reduced curves of degree two. We construct suitable smooth parameter…