Abstract

A Q\mathbb Q-conic bundle germ is a proper morphism from a threefold with only terminal singularities to the germ (Z∋o)(Z \ni o) of a normal surface such that fibers are connected and the anti-canonical divisor is relatively ample. We obtain the complete classification of Q\mathbb Q-conic bundle germs when the base surface germ is singular. This is a generalization of our previous paper math/0603736, which further assumed that the fiber over oo is irreducible.

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On Q-conic bundles, II | BZPEER