Skip to main content
replaced http://mathoverflow.net/ with https://mathoverflow.net/
Source Link

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 asking the question. For a corrected version, check out this one.this one.

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 asking the question. For a corrected version, check out this one.

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 asking the question. For a corrected version, check out this one.

Post Closed as "no longer relevant" by Harry Gindi, Gjergji Zaimi, Yemon Choi, Kim Morrison
made it make sense
Source Link
Harry Gindi
  • 19.6k
  • 16
  • 123
  • 215

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 reformulatingasking the question. For a corrected version, check out this one.

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 this one.

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 asking the question. For a corrected version, check out this one.

added 214 characters in body; edited title
Source Link
Paul Yuryev
  • 422
  • 4
  • 13

Example of restriction of a finite morphisminclusion which is not a finite morphism

Every 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 restrictioninclusion $f|_X$$X\hookrightarrow Y$ is not finite? Same with Y -- projective?

PS.Thanks!

Edit: Sorry the original version of this question was hilariously stupid.is very simple, I made a mistake in reformulating this one.

Example of restriction of a finite morphism which is not finite

Every 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 $f|_X$ is not finite? Same with Y -- projective?

PS. Sorry the original version of this question was hilariously stupid.

Example of inclusion which is not a finite morphism

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 this one.

added 192 characters in body; edited title
Source Link
Paul Yuryev
  • 422
  • 4
  • 13
Loading
Source Link
Paul Yuryev
  • 422
  • 4
  • 13
Loading