Barja, Miguel ÁngelGonzález-Alonso, VíctorNaranjo del Val, Juan Carlos2023-05-022023-05-022016-01-140075-4102https://hdl.handle.net/2445/197444We prove that the genus $g$, the relative irregularity $q_f$ and the Clifford index $c_f$ of a non-isotrivial fibration $f$ satisfy the inequality $q_f \leq g-c_f$. This gives in particular a proof of Xiao's conjecture for fibrations whose general fibres have maximal Clifford index.12 p.application/pdfeng(c) Walter de Gruyter, 2016Geometria algebraicaSuperfícies algebraiquesAlgebraic geometryAlgebraic surfacesinfo:eu-repo/semantics/article6538992023-05-02info:eu-repo/semantics/openAccess