We prove that any symplectic 4-manifold which is not a rational or ruledsurface, after sufficiently many blow-ups, admits an arbitrary number ofnonisomorphic Lefschetz fibrations of the same genus which cannot be obtainedfrom one another via Luttinger surgeries. This generalizes results of Park andYun who constructed pairs of nonisomorphic Lefschetz fibrations on knotsurgered elliptic surfaces. In turn, we prove that there are monodromyfactorizations of Lefschetz pencils which have the same characteristic numbersbut cannot be obtained from each other via partial conjugations by Dehn twists,answering a problem posed by Auorux.
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