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Feb 21, 2014 at 16:58 comment added Li Yutong I did not assume $|D|$ to be basepoint free, acturally, the case when it has basepoint is what I bothered. Another thing is, $E$ is exceptional divisor of $f^{-1}$.
Feb 21, 2014 at 14:39 review First posts
Feb 21, 2014 at 14:42
Feb 21, 2014 at 14:20 history answered user110111 CC BY-SA 3.0