Threefold extremal contractions of types (IC) and (IIB)

preprint2011arXivOpen access

Abstract

Let (X,C)(X,C) be a germ of a threefold XX with terminal singularities along an irreducible reduced complete curve CC with a contraction f:(X,C)→(Z,o)f: (X,C)\to (Z,o) such that C=f−1(o)redC=f^{-1}(o)_{red} and −KX-K_X is ample. Assume that (X,C)(X,C) contains a point of type (IC) or (IIB). We complete the classification of such germs in terms of a general member H∈∣OX∣H\in |\mathcal O_X| containing CC.

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