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math.AG2001
On quadrisecant lines of threefolds in P^5
Emilia Mezzetti
We study smooth threefolds of the projective space of dimension 5 whose quadrisecant lines don't fill up the space. We give a complete classification of those threefolds X whose on…
math.AG2001
On projective varieties of dimension n+k covered by k-spaces
Emilia Mezzetti, Orsola Tommasi
We study families of linear spaces in projective space whose union is a proper subvariety X of the expected dimension. We establish relations between configurations of focal points…