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A remark on algebraic surfaces with polyhedral Mori cone

Published online by Cambridge University Press:  22 January 2016

Viacheslav V. Nikulin
Viacheslav V. Nikulin*
Affiliation:
Steklov Mathematical Institute, ul. Gubkina 8, Moscow 117966, GSP-1, RussiaDept. of Pure Math. of the University of Liverpool, Liverpool L69 3BX, Englandslava@nikulin.mian.su, V.Nikulin@liverpool.ac.uk
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Abstract

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We denote by FPMC the class of all non-singular projective algebraic surfaces X over ℂ with finite polyhedral Mori cone NE(X) ⊂ NS(X) ⊗ ℝ. If ρ(X) = rk NS(X) ≥ 3, then the set Exc(X) of all exceptional curves on X ∈ FPMC is finite and generates NE(X). Let δE(X) be the maximum of (-C2) and pE(X) the maximum of pa(C) respectively for all C ∈ Exc(X). For fixed ρ ≥ 3, δE and pE we denote by FPMCρ,δE,pE the class of all algebraic surfaces X ∈ FPMC such that ρ(X) = ρ, δE(X) = δE and pE(X) = pE. We prove that the class FPMCρ,δE,pE is bounded in the following sense: for any X ∈ FPMCρ,δE,pE there exist an ample effective divisor h and a very ample divisor h′ such that h2 ≤ N(ρ, δE) and h′2 ≤ N′(ρ, δE, pE) where the constants N(ρ, δE) and N′(ρ, δE, pE) depend only on ρ, δE and ρ, δE, pE respectively.

One can consider Theory of surfaces X ∈ FPMC as Algebraic Geometry analog of the Theory of arithmetic reflection groups in hyperbolic spaces.

Type
Research Article
Information
Nagoya Mathematical Journal , Volume 157 , 2000 , pp. 73 - 92
Copyright
Copyright © Editorial Board of Nagoya Mathematical Journal 2000

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