Exercise 111.33.9. (This is pretty hard.) Given an example of a scheme $X$, and open subscheme $U \subset X$ and a closed subscheme $Z \subset U$ such that $Z$ does not extend to a closed subscheme of $X$.
Exercise 111.33.9. (This is pretty hard.) Given an example of a scheme $X$, and open subscheme $U \subset X$ and a closed subscheme $Z \subset U$ such that $Z$ does not extend to a closed subscheme of $X$.
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