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math.AG2004
Even sets of four nodes on rational surfaces
Alberto Calabri, Ciro Ciliberto, Margarida Mendes Lopes
We describe smooth rational projective algebraic surfaces X, over an algebraically closed field of characteristic different from 2, having an even set of four disjoint (-2)-curves…
math.AG2004
Canonical map of low codimensional subvarieties
Valentina Beorchia, Ciro Ciliberto, Vincenzo Di Gennaro
Fix integers , and . We prove that for certain projective varieties (e.g. certain possibly singular complete intersections), there are only fi…