John Cremona
John Cremona
About the pre- and post-isomorphisms: the original implementation of isogenies was done by someone who was only interested in curves over finite fields, who wanted all isogenies to be normalised...
As I gave this a positive review several months ago it would be helpful for someone to tell me what now needs to be checked, as otherwise I'll have to...
@user202729 Why is your username anonymous?
Thanks for the explanation. I think that the changes around line 330 (where the first error occurs in the current Sage version) are fine, but an alternative is to change...