Summary
It is (almost) known that the Galois action on etale cohomology of a Hilbert modular variety extends to an action of a bigger group. We show that this bigger group acts on the set of CM points.
2000 Mathematics Subject Classifications: 11G15, 11F41
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To Yuri Manin on the occasion of his 70th birthday, with admiration
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Nekovář, J. (2009). Hidden Symmetries in the Theory of Complex Multiplication. In: Tschinkel, Y., Zarhin, Y. (eds) Algebra, Arithmetic, and Geometry. Progress in Mathematics, vol 270. Birkhäuser Boston. https://doi.org/10.1007/978-0-8176-4747-6_13
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DOI: https://doi.org/10.1007/978-0-8176-4747-6_13
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