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In mathematics, a Raynaud surface is a particular kind of algebraic surface that was introduced in (Lang 1979) and named for Raynaud (1978). To be precise, a Raynaud surface is a quasi-elliptic surface over an algebraic curve of genus g greater than 1, such that all fibers are irreducible and the fibration has a section. The Kodaira vanishing theorem fails for such surfaces; in other words the Kodaira theorem, valid in algebraic geometry over the complex numbers, has such surfaces as counterexamples, and these can only exist in characteristic p.

Generalized Raynaud surfaces were introduced in (Lang 1983), and give examples of surfaces of general type with global vector fields.


Lang, William E. (1979), "Quasi-elliptic surfaces in characteristic three", Annales Scientifiques de l'École Normale Supérieure. Quatrième Série 12 (4): 473–500, ISSN 0012-9593, MR 565468
Lang, William E. (1983), "Examples of surfaces of general type with vector fields", Arithmetic and geometry, Vol. II, Progr. Math. 36, Boston, MA: Birkhäuser Boston, pp. 167–173, MR 717611
Raynaud, Michel (1978), "Contre-exemple au "vanishing theorem" en caractéristique p > 0", C. P. Ramanujam---a tribute, Tata Inst. Fund. Res. Studies in Math. 8, Berlin, New York: Springer-Verlag, pp. 273–278, MR 541027

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