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Published online by Cambridge University Press: 05 September 2018
In this paper, we investigate the weak forms of the 2-part of the conjecture of Birch and Swinnerton-Dyer, and prove a lower bound for the 2-adic valuation of the algebraic part of the central value of the complex L-series for the family of quadratic twists of all optimal elliptic curves over ${\mathbb Q}$.
Supported by Shandong Province Natural Science Foundation (Grant No. ZR2016AP03)