Ahmad Mostafa Ismail El-Guindy on Fri, 03 May 2024 14:34:27 +0200


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ellisisom?

Hello,

In this link 
https://pari.math.u-bordeaux.fr/dochtml/html/Elliptic_curves.html

there is the description below of the function ellisisom

ellisisom(E, F)
Return 0 if the elliptic curves E and F defined over the same number field are not isomorphic, otherwise return [u,r,s,t] suitable for ellchangecurve, mapping E to F.

The library syntax is GEN ellisisom(GEN E, GEN F).

However, this function is not present either in the current version ( GP/PARI CALCULATOR Version 2.15.5 (released)) or in its documentation (naturally) 

https://pari.math.u-bordeaux.fr/dochtml/html-stable/

My question is whether there is a substitute (and was there a reason for the removal)?

Thanks,

Ahmad