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A flip can be thought of as a diagram X−→X←X+ of complex threefolds satisfying some conditions. One often thinks of a flip as being in two parts: the first part, X−→X, is the given, while the second, X←X+, is the unknown. I calculate cohomological properties of the canonical classes, K−=KX− and so on, and in particular properties of the function
Bulletin of the London Mathematical Society – Wiley
Published: Sep 1, 1999
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