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Showing 1 to 3 of 3 for “"Cremona transformations"”.
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Negative answers to some positivity questions
… and in particular on the action of standard Cremona transformations on blow-ups of projective space at configurations of points. The main examples include the following: nefness is not an open condition in families; the diminished base locus of a divisor is not always a closed set; Zariski …