Abstract:
A new method is applied to the study of del Pezzo surfaces ZZ with log-terminal singularities, taken from the theory of reflection groups in Lobachevsky space. This method yields bounds on the Picard number ρ(Y)ρ(Y) of a minimal resolution YY of singularities of ZZ, assuming that the indices or the multiplicities of the singularities of ZZ are bounded, and under an extra (conjecturally inessential) condition of generality on the singularities of ZZ.
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