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, i.e. such that the sum of the four curves is divisible by 2 in the Picard group of X.
Even sets of four nodes on rational surfaces
CALABRI, Alberto;
2004
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, i.e. such that the sum of the four curves is divisible by 2 in the Picard group of X.File in questo prodotto:
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