Even sets of four nodes on rational surfaces
Alberto Calabri, Ciro Ciliberto, Margarida Mendes Lopes
Abstract
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 N1,...,N4, i.e. such that N1+...+N4 is divisible by 2 in Pic(X).
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