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This is an exercise in Hartshorne's book.

For a quasi projective variety $Y$ with dimension $\geq 2$ and $p \in Y$ a normal point, if $f$ is regular on $Y-\{p\}$ then $f$ can be extended to a regular function on $Y$.

I want to get some hints to prove this problem....

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    What part do you not understand? If you tell us, then you'll get better hints.2016-08-08

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