Some algebraic and geometric properties of hyper-Kähler fourfold symmetries

preprint2020arXivOpen access

Abstract

We complete the classification of order 55 nonsymplectic automorphisms on hyper-Kähler fourfolds deformation equivalent to the Hilbert square of a K3 surface. We then compute the topological Lefschetz number of natural automorphisms of generalized Kummer fourfolds and we describe the geometry of their fix loci.

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