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Bug in elliptic curve isogeny #19840
Comments
comment:1
I found the bug: on line 868, The bug was not caught by the doctests since the only example where this code was tested had a=1. |
comment:2
To review, run the code in the description before and after; note that a doctest is added with this example. New commits:
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Branch: u/cremona/19840 |
Commit: |
comment:3
There is a small merge conflict with #19689 so I will rebase this on that and make that ticket a dependency. |
Dependencies: #19689 |
comment:6
two details:
but should be
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comment:7
Replying to @fchapoton:
Thanks, I am fixing those now and hope we can this into 7.0. |
Branch pushed to git repo; I updated commit sha1. New commits:
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comment:9
Don't forget to fill in the "reviewer" box :) |
comment:10
sorry, still not formatted correctly, should be in fact
with a double colon at the end. Once done, you can set a positive review. |
Reviewer: Frédéric Chapoton |
comment:11
Sorry, will do. It is so hard to actually test correct formatting of docstrings since it takes a very long time to build doc and the output is thousamds of lines somewhere in which is the relevant line or two. |
Branch pushed to git repo; I updated commit sha1. New commits:
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comment:14
7.0 please! |
Changed branch from u/cremona/19840 to |
There is a bug in the code to compute 5-isogenies of elliptic curves of j-invariant 1728, when 5 is a square.
or more directly
I wrote this code about 5 years ago, and will fix it.
Depends on #19689
Component: elliptic curves
Keywords: isogenies
Author: John Cremona
Branch/Commit:
8ce0e65
Reviewer: Frédéric Chapoton
Issue created by migration from https://trac.sagemath.org/ticket/19840
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