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Abstract des Vortrages von Sławek Rams

On Enriques surfaces with four cusps

One can show that maximal number of A2-configurations on an Enriques surface is four. In my talk I will classify all Enriques surfaces with four A2-configurations. In particular I will show that they form two families in the moduli of Enriques surfaces and I will construct open Enriques surfaces with fundamental groups (Z/3Z)⊕2 × Z/2Z and Z/6Z, completing the picture of the A2 -case and answering a question put by Keum and Zhang. (joint work with Prof. M. Schütt/LUH Hannover)