In the ordinary case, is it possible to get the regular function 
corresponding to some endomorphism?

On Wednesday, January 22, 2020 at 1:40:54 PM UTC-5, John Cremona wrote:
>
> I suspect the question might have been referring to elliptic curves over 
> finite fields. In the ordinary case you can ask for the Frobenius order and 
> know that the endomorphism ring is between that and the maximal order of 
> its field of fractions (an imaginary quadratic field) but as far as I know 
> Sage jas no implementation of finding the exact endomorphism ring such as 
> Kohel's algorithm.

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