Glasnik Matematicki, Vol. 35, No.2 (2000), 335-337.
ON ISOGENIES OF ELLIPTIC CURVES
Ivica Gusić
University of Zagreb, Faculty of Chemical Engineering and Technology,
p.p. 177, 10001 Zagreb, Croatia
e-mail: igusic@pierre.fkit.hr
Abstract. We give a characterization of ellptic curves
which are isogenous over two different quadratic extensions of a
fixed number field.
1991 Mathematics Subject Classification.
14H52.
Key words and phrases. Elliptic curves with complex
multiplication, isogeny.
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