Threefold extremal contractions of type (IIA), I

Abstract

Let $(X,C)$ be a germ of a threefold $X$ with terminal singularities along an irreducible reduced complete curve $C$ with a contraction $f:(X,C)\to (Z,o)$ such that $C=f^{-1}(o{)}_{red}$ and $-K_X$ is ample. Assume that $(X,C)$ contains a point of type (IIA) and that a general member $H\in |O_X|$ containing $C$ is normal. We classify such germs in terms of $H$.

26 pages, latex

References in corpus (1)

• Threefold extremal contractions of type IA