ASKSAGE: Sage Q&A Forum - RSS feedhttps://ask.sagemath.org/questions/Q&A Forum for SageenCopyright Sage, 2010. Some rights reserved under creative commons license.Tue, 17 Mar 2020 20:57:45 +0100Exponential for elliptic curve formal grouphttps://ask.sagemath.org/question/50284/exponential-for-elliptic-curve-formal-group/ Hi,
This is a short and potentially quite simple question - the formal group object for an elliptic curve allows you to compute its logarithm, i.e. the isomorphism from the formal group to the additive formal group. Is it possible to find the exponential as well? If this is not built in, this would just reduce to finding a power series $g$ such that $f(g(T))=T$ for a given $f$. Is this possible with the power series tools?
Thanks!Tue, 17 Mar 2020 18:56:54 +0100https://ask.sagemath.org/question/50284/exponential-for-elliptic-curve-formal-group/Comment by vdelecroix for <p>Hi,</p>
<p>This is a short and potentially quite simple question - the formal group object for an elliptic curve allows you to compute its logarithm, i.e. the isomorphism from the formal group to the additive formal group. Is it possible to find the exponential as well? If this is not built in, this would just reduce to finding a power series $g$ such that $f(g(T))=T$ for a given $f$. Is this possible with the power series tools?</p>
<p>Thanks!</p>
https://ask.sagemath.org/question/50284/exponential-for-elliptic-curve-formal-group/?comment=50286#post-id-50286duplicate of https://ask.sagemath.org/question/50285/exponential-for-formal-group-of-elliptic-curve/Tue, 17 Mar 2020 20:57:45 +0100https://ask.sagemath.org/question/50284/exponential-for-elliptic-curve-formal-group/?comment=50286#post-id-50286