Seshadri fibrations of algebraic surfaces
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We refine results of Hwang, Keum and Szemberg, Tutaj-Gasinska which relate local invariants - Seshadri constants - of ample line bundles on surfaces to the global geometry - fibration structure. We show that the same picture emerges when looking at Seshadri constants measured at any finite subset of the given surface.
8 pages, to appear in Math. Nachr
8 pages, to appear in Math. Nachr