Vol. 3, No. 6, 2009

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Effectiveness of the log Iitaka fibration for 3-folds and 4-folds

Gueorgui Todorov and Chenyang Xu

Vol. 3 (2009), No. 6, 697–710
Abstract

We prove the effectiveness of the log Iitaka fibration in Kodaira codimension two for varieties of dimension $\le 4$. In particular, we finish the proof of effective log Iitaka fibration in dimension two. Also, we show that for the log Iitaka fibration, if the fiber is of dimension two, the denominator of the moduli part is bounded.

Keywords
Iitaka fibration, boundedness
Mathematical Subject Classification 2000
Primary: 14E05
Secondary: 14J35, 14J30