Broken Lefschetz fibrations and smooth structures on 4-manifolds

preprint2012arXivOpen access

Abstract

The broken genera are orientation preserving diffeomorphism invariants of closed oriented 4-manifolds, defined via broken Lefschetz fibrations. We study the properties of the broken genera invariants, and calculate them for various 4-manifolds, while showing that the invariants are sensitive to exotic smooth structures.

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