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On fields of definition of torsion points of elliptic curves with complex multiplication

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For any elliptic curve $E$ defined over the rationals with complex multiplication (CM) and for every prime $p$, we describe the image of the mod $ p$ Galois representation attached to $E$. We deduce information about the field of definition of torsion points of these curves; in particular, we classify all cases where there are torsion points over Galois number fields not containing the field of definition of the CM.

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DIEULEFAIT, L. V. (Luis Victor), GONZALEZ-JIMENEZ, Enrique and JIMENEZ URROZ, Jorge. On fields of definition of torsion points of elliptic curves with complex multiplication. Proceedings of the American Mathematical Society. 2011. Vol. 139, num. 6, pags. 1961-1969. ISSN 0002-9939. [consulted: 28 of May of 2026]. Available at: https://hdl.handle.net/2445/96600

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