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A note on degenerations of del Pezzo surfaces

Published 25 Aug 2011 in math.AG | (1108.5051v2)

Abstract: We prove that for a Q-Gorenstein degeneration $X$ of del Pezzo surfaces, the number of non-Du Val singularities is at most $\rho(X)+2$. Degenerations with $\rho(X)+2$ and $\rho(X)+1$ non-Du Val points are investigated.

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