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Finiteness of the polyhedral Q-codegree spectrum

In this paper we show that the spectrum of the Q-codegree of a d-dimensional lattice polytope is finite above any positive threshold in the class of lattice polytopes with α-canonical normal fan for any fixed α>0. For α=1/r this includes lattice polytopes with Q-Gorenstein normal fan of index r. In particular, this proves Fujita's Spectrum Conjecture for polarized varieties in the case of Q-Gorenstein toric varieties of index r.

preprint2013arXivOpen access
Andreas Paffenholz
math.COmath.AG
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Andreas Paffenholz

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