Effective log Iitaka fibrations for surfaces and threefolds

Details Effective log Iitaka fibrations for surfaces and threefolds Effective log Iitaka fibrations for surfaces and threefolds

2008-05-22

arxiv.org/abs/0805.3494v1

Mathematics

Algebraic Geometry

Scientific paper

We prove an analogue of Fujino and Mori's ``bounding the denominators'' in the log canonical bundle formula (see also Prokhorov and Shokurov) for Kawamata log terminal pairs of relative dimension one. As an application we prove that for a klt pair $(X,\Delta)$ of Kodaira codimension one and dimension at most three such that the coefficients of $\Delta$ are in a DCC set $\mathcal{A}$, there is a natural number $N$ that depends only on $\mathcal{A}$ for which the round down of $\N(K_X+\Delta)$ induces the Iitaka fibration. We also prove a birational boundedness result for klt surfaces of general type.

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