Melle Hernández, AlejandroWall, Charles Terence Clegg2023-06-202023-06-202001-090024-611510.1112/plms/83.2.257https://hdl.handle.net/20.500.14352/57097Although the theory of singularities of curves - resolution, classification, numerical invariants - goes through with comparatively little change in finite characteristic, pencils of curves are more difficult. Bertini's theorem only holds in a much weaker form, and it is convenient to restrict to pencils such that, when all base points are resolved, the general member of the pencil becomes non-singular. Even here, the usual rule for calculating the Euler characteristic of the resolved surface has to be modified by a term measuring wild ramification. We begin by describing this background, then proceed to discuss the exceptional members of a pencil. In characteristic 0 it was shown by Há and Lê and by Lê and Weber, using topological reasoning, that exceptional members can be characterised by their Euler characteristics. We present a combinatorial argument giving a corresponding result in characteristic p. We first treat pencils with no base points, and then reduce the remaining case to this.engjournal articlehttp://plms.oxfordjournals.org/open access512.7Numerical invariants of singularitiesCharacteristic pSingularities of curvesResolutionBertini’s theoremPencilEuler characteristicWild ramificationGeometria algebraica1201.01 Geometría Algebraica