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Published online by Cambridge University Press: 24 October 2008
Let ψ be the Grossencharacter attached to an elliptic curve E defined over an imaginary quadratic field K ⊂ 
 of discriminant −dK, and having complex multiplication by the maximal order 
 of K. We denote the conductor of ψ by 
 and fix a Weierstrass model for E with coefficients in 
,

whose discriminant 
 is divisible only by primes dividing 6
. Let Kab be the abelian closure of K in 
 and choose a fundamental period Ω ∈ 
 for the above model of the curve.