Tamagawa Products of Elliptic Curves Over ℚ
Abstract We explicitly construct the Dirichlet series $$\begin{equation*}L_{\mathrm{Tam}}(s):=\sum_{m=1}^{\infty}\frac{P_{\mathrm{Tam}}(m)}{m^s},\end{equation*}$$ where $P_{\mathrm{Tam}}(m)$ is the proportion of elliptic curves $E/\mathbb{Q}$ in short Weierstrass form with Tamagawa product m. Although there are no $E/\mathbb{Q}$ with everywhere good reduction, we prove that the proportion with trivial Tamagawa product is $P_{\mathrm{Tam}}(1)={0.5053\dots}$. As a corollary, we find that $L_{\mathrm{Tam}}(-1)={1.8193\dots}$ is the average Tamagawa product for elliptic curves over $\mathbb{Q}$. We give an application of these results to canonical and Weil heights.
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2016 ◽
Vol 12
(02)
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pp. 445-463
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1986 ◽
Vol 12
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pp. 45-52
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2015 ◽
Vol 11
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pp. 1149-1164
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1984 ◽
Vol 96
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pp. 25-38
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1979 ◽
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pp. 273-279
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