Niemeier Lattices and K3 Groups
classification
🧮 math.AG
keywords
actionactsalternatingconsidercyclicdeterminediscriminantextension
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In this note, we consider K3 surfaces X with an action by the alternating group A_5. We show that if a cyclic extension A_5 . C_n acts on X then n = 1, 2, or 4. We also determine the A_5-invariant sublattice of the K3 lattice and its discriminant form.
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