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Post Closed as "no longer relevant" by Harry Gindi, Gjergji Zaimi, Yemon Choi, Scott Morrison♦
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Every closed immersion is a finite morphism. Can you give an example of quasi-projective varieties $X\subset Y$ such that inclusion $X\hookrightarrow Y$ is not finite? Same with Y projective? Thanks! Edit: Sorry this question is very simple, I made a mistake in reformulating asking the question. For a corrected version, check out this one. |
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Example of restriction of a finite morphism inclusion which is not a finite morphismEvery closed immersion is a finite morphism. Therefore, restriction of a finite morphism to a closed subset is always a finite morphism itself. Can you give an example of quasi-projective varieties $X\subset Y$ , $Z$ and a finite morphism $f:Y\to Z$ such that restriction inclusion $f|_X$ X\hookrightarrow Y$ is not finite? Same with Y -- projective? PS. Thanks! Edit: Sorry the original version of this question was hilariously stupidis very simple, I made a mistake in reformulating this one. |
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