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Oct 26, 2021 at 7:48 comment added François Brunault @chaad An elliptic curve over $\mathbb{R}$ can be approximated by elliptic curves over $\mathbb{Q}$, so one cannot say more in general.
Oct 25, 2021 at 11:40 history edited Glorfindel CC BY-SA 4.0
edited body
Oct 25, 2021 at 2:42 history edited Joe Silverman CC BY-SA 4.0
Fixed a typo, and added some material
Oct 25, 2021 at 0:09 comment added Adithya Chakravarthy Thank you! One follow-up: if $E$ is defined over the rationals, then can anything stronger be said about our choice of $\tau$? E.g- can we say anything about the imaginary part of $\tau$ as well? Or is this the best that we can say in general?
Oct 25, 2021 at 0:08 vote accept Adithya Chakravarthy
Oct 25, 2021 at 0:05 vote accept Adithya Chakravarthy
Oct 25, 2021 at 0:08
Oct 24, 2021 at 23:17 comment added Wojowu I think it should be $\tau=ti$ or $\tau=\frac{1}{2}+ti$.
Oct 24, 2021 at 23:15 history answered Joe Silverman CC BY-SA 4.0