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Given some type of fibration on a 4-manifold with a torus regular fiber , we may produce a new 4-manifold by performing torus surgery on . There is a natural way to extend the fibration to , but a multiple fiber (non-generic) singularity is introduced. We construct explicit generic fibrations (with only indefinite fold singularities) in a neighborhood of this multiple fiber. As an application this gives explicit constructions of broken Lefschetz fibrations on all elliptic surfaces (e.g. the family ). As part of the construction we produce generic fibrations around exceptional fibers of Seifert fibered spaces.

生成讲解博客的中文版本

生成AI智能校验的中文版本