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Numerical Godeaux surfaces with an involution. (English) Zbl 1124.14036

Summary: Minimal algebraic surfaces of general type with the smallest possible invariants have geometric genus zero and \( K^2=1\) and are usually called numerical Godeaux surfaces. Although they have been studied by several authors, their complete classification is not known. In this paper we classify numerical Godeaux surfaces with an involution, i.e. an automorphism of order 2. We prove that they are birationally equivalent either to double covers of Enriques surfaces or to double planes of two different types: the branch curve either has degree 10 and suitable singularities, originally suggested by Campedelli, or is the union of two lines and a curve of degree 12 with certain singularities. The latter type of double planes are degenerations of examples described by Du Val, and their existence was previously unknown; we show some examples of this new type, also computing their torsion group.

MSC:

14J29 Surfaces of general type
14J25 Special surfaces
14J50 Automorphisms of surfaces and higher-dimensional varieties

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