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Nov 16, 2020 at 13:34 comment added user125056 Exactly, $f$ only contracts the strict transform of $D$ and it is birational on its complement.
Nov 15, 2020 at 6:47 comment added Karl Schwede f only contacts the strict transform of D?
Nov 7, 2020 at 19:12 history asked user125056 CC BY-SA 4.0