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Not to be confused with J (New York City Subway service).
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with the j-invariant normalized a la Tate: j = 0 has complex multiplication by Z[ζ3], and j = 1728 by Z[i].
- Katz, Nicholas M.; Mazur, Barry (1985), Arithmetic moduli of elliptic curves, Annals of Mathematics Studies 108, Princeton University Press, Princeton, NJ, p. 228, ISBN 0-691-08349-5, MR 772569.
- Gouvêa, Fernando Q. (2001), "Deformations of Galois representations", Arithmetic algebraic geometry (Park City, UT, 1999), IAS/Park City Math. Ser. 9, Amer. Math. Soc., Providence, RI, pp. 233–406, MR 1860043. See in particular p. 378.
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