A view on contractions of higher dimensional varieties
Marco Andreatta, Jaroslaw A. Wiśniewski
Abstract
In this paper we discuss some recent results about extremal contractions of complex algebraic varieties. These are proper surjective maps, ϕ: X Z, of normal varieties with connected fibers such that X has mild singularities (in particular X is Q-Gorenstein) and the anticanonical divisor of X is ϕ ample. It will appear on the Proceedings of AMS-SRI on Algebraic Geometry, Santa Cruz 1995.
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