Commun. Korean Math. Soc. 2003; 18(4): 603-613
Printed December 1, 2003
Copyright © The Korean Mathematical Society.
Dong-Kwan Shin
Konkuk University
When $X$ is a threefold of general type, it is well known $h^0(X,\cx(nK_X))\geq 1$ for a sufficiently large $n$. When $\ex>0 $, it is not easy to obtain such an integer $n$. A. R. Fletcher showed that $h^0(X,\cx(nK_X))\geq 1$ for $n=12$ when $\ex=1$. We introduce a technique different from A. R. Fletcher's. Using this technique, we also prove the same result as he showed and have a new result.
Keywords: threefold of general type, plurigenus
MSC numbers: 14J17, 14J30
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