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 Nonvanishing of a plurigenus of a threefold of general type Commun. Korean Math. Soc. 2003 Vol. 18, No. 4, 603-613 Printed December 1, 2003 Dong-Kwan Shin Konkuk University Abstract : 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 Downloads: Full-text PDF

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