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Nov 2, 2018 at 20:15 history edited David Roberts CC BY-SA 4.0
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Mar 15, 2011 at 11:26 comment added Leo Alonso Isn't it enough that the scheme is semi-separated? Semi-separated means just that the intersection of affines is affine, a condition strictly weaker that separation.
Nov 17, 2009 at 13:13 history answered Shizhuo Zhang CC BY-SA 2.5