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Kolyvagin’s descent and Mordell-Weil groups over ring class fields. (English) Zbl 0712.14008
The authors prove the following theorem: Let E be a modular elliptic curve and H/K be a ring class field extension of a suitable imaginary quadratic field K. Let $$\alpha\in E(H)$$ denote a Heegner point defined over H, and let $$\chi$$ denote a complex character of the Galois group of H/K. - If the $$\chi$$-component of $$\alpha$$ is nonzero, then the complex dimension of the $$\chi$$-component of E(H) is one.
This statement was conjectured by B. H. Gross in Modular forms, Symp. Durham/Engl. 1983, 87-105 (1984; Zbl 0559.14011), in view of the Birch and Swinnerton-Dyer conjecture and the Gross-Zagier theorem, and proved by V. A. Kolyvagin [“Euler systems” in the Grothendieck Festschrift, Vol. II, Proc. Math. 87, 435-483 (1990)] when $$\chi$$ is the trivial character. The authors apply the ideas of Kolyvagin to prove the general case.

##### MSC:
 14G05 Rational points 14G10 Zeta functions and related questions in algebraic geometry (e.g., Birch-Swinnerton-Dyer conjecture) 14H52 Elliptic curves 14G35 Modular and Shimura varieties
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