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Overview
Propose
Stacks 01KU (2)
theorem
Let $X$, $Y$, $Z$ be schemes, and possibly some arrows, satisfying the following conditions:
$f$ quasi-separated
$g$ quasi-separated
Then
$g*f$ quasi-separated
References
Stacks Project, https://stacks.math.columbia.edu/tag/01KU (Fabio)
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