Nef与富足因子、半满性与典范丛公式
Nef and abundant divisors, semiampleness and canonical bundle formula
摘要:
本文利用典范丛公式证明了Kawamata关于nef和富足对数典范除子的半满性的一个旧定理的某些推广。特别是,我们表明,对于klt对$(X,B)$与$K_X+B$有效,$L \in Pic (X)$ nef,nef和丰富的$K_X+B+L$意味着半扩增。这实质上将川俣定理推广到广义丰度的设定。
英文摘要:
In this paper, we use canonical bundle formulas to prove some generalizations of an old theorem of Kawamata on the semiampleness of nef and abundant log canonical divisors. In particular, we show that for klt pairs $(X,B)$ with $K_X+B$ effective, $L \in Pic (X)$ nef, nefness and abundance of $K_X+B+L$ implies semiampleness. This essentially generalizes Kawamata's theorem to the setting of generalized abundance.
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