On Tuesday, January 21, 2020 at 5:23:43 PM UTC-8, Eric Zhu wrote:
>
> Is there a way to get the endomorphism ring of an elliptic curve in Sage? 
>

with

d=E.cm_discriminant() 

you know that End(E) is the cm order of discriminant d. If E does not have 
cm, then End(E)=Z

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