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Last-modified: 2011-09-15 (木) 21:31:47

Definition Edit

Let X be a topological space.
A subset C is called retrocompact if for every quasi-compact (i.e. compact but not necessarily Hausdorff) open set U, the intersection of U and C is quasi-compact.

Reference Edit

Ulrich Gortz and Torsten Wedhorn, Algebraic geometry I: schemes with examples and exercises, Vieweg Teubner Verlag, 2010.