Opened 12 years ago

Closed 6 years ago

## #9410 closed defect (wontfix)

# EC.local_data() can't handle extensions of number fields

Reported by: | Armin Straub | Owned by: | John Cremona |
---|---|---|---|

Priority: | major | Milestone: | sage-duplicate/invalid/wontfix |

Component: | elliptic curves | Keywords: | local_data |

Cc: | William Stein, Charlie Turner, Pin-Hung Kao | Merged in: | |

Authors: | Reviewers: | Armin Straub | |

Report Upstream: | N/A | Work issues: | |

Branch: | Commit: | ||

Dependencies: | Stopgaps: |

### Description

In 4.4.4 the following code produces a ValueError?:

sage: K.<a> = NumberField(x^2+1) sage: L.<b> = K.extension(x^2-17) sage: E = EllipticCurve(L, [1,1]) sage: E.local_data()

As a workaround, one can use absolute_field:

L1.<c> = L.absolute_field() E1 = EllipticCurve(L1, [1,1]) E1.local_data()

### Change History (9)

### comment:1 Changed 6 years ago by

### comment:2 Changed 6 years ago by

Choose invalid/dontfix from the Milestone menu (under "Modify Ticket"). It will the be closed.

I think it has been fixed for ages, but it hardly seems worth looking for when. Thanks for noticing -- I'll let you follow the above instructions.

### comment:3 Changed 6 years ago by

yes, please set to positive review with milestone "duplicate invalid wontfix"

### comment:4 Changed 6 years ago by

Milestone: | → sage-duplicate/invalid/wontfix |
---|

Thank you both! I have changed the milestone as instructed.

There was no option yet to flag this as positively reviewed, so I didn't do that. My guess is that one has to first set the ticket as "needs review" before that option becomes available. If this should be done, please let me know.

### comment:5 Changed 6 years ago by

Status: | new → needs_review |
---|

yes, this is a 2-step job. I did the first step for you, you can now do the second step. You could have done both yourself.

### comment:6 Changed 6 years ago by

Status: | needs_review → positive_review |
---|

Thanks! I was hesitant to do that without understanding what will happen. It is set to "positive review" now (with no reviewer, but I hope that is OK in such a case).

### comment:7 Changed 6 years ago by

I am not sure if we need a reviewer here, but you can add your name for safety.

### comment:9 Changed 6 years ago by

Resolution: | → wontfix |
---|---|

Status: | positive_review → closed |

Determined to be invalid/duplicate/wontfix (closing as "wontfix" as a catch-all resolution).

**Note:**See TracTickets for help on using tickets.

This seems to have been fixed since I reported this a couple of years ago, so this ticket can be closed. Can/should I do something to flag the ticket as such?