FUNDAMENTALNAYA
I PRIKLADNAYA MATEMATIKA

(FUNDAMENTAL AND APPLIED MATHEMATICS)

1998, VOLUME 4, NUMBER 2, PAGES 757-761

M. M. Grinenko

Abstract

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```
Let
```$X$ be a normal projective surface and
anticanonical divisor $-K_{X}$ is numerically positive.
Then $-K_{X}$ is numerically ample
and rationality of $X$ is equivalent to
its $\mathbb Q$ -factoriality.

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