In Proposition 1.4.18(Chow's Lemma), how to show the image of $U$ in $X'$ is dense?
2026-03-28 22:36:50.1774737410
How to show the image of $U$ in $X'$ is dense?
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Because of the above conclusion labeled by red underline, the image of $U$ in $X'$ is dense.
Now I want to know why the following diagram commutes.