Opened 11 years ago

Closed 7 years ago

#11697 closed defect (fixed)

global minimal model for elliptic curves in number fields with non-trivial class group

Reported by: wuthrich Owned by: cremona
Priority: major Milestone: sage-duplicate/invalid/wontfix
Component: elliptic curves Keywords: global minimal model
Cc: Merged in:
Authors: Reviewers: Frédéric Chapoton
Report Upstream: N/A Work issues:
Branch: Commit:
Dependencies: Stopgaps:

Status badges

Description

Currently sage rejects to produce the global minimal Weierstrass equation when the class number is not 1. For instance, this produces an error: 

sage: K.<t> = QuadraticField(-5)
sage: E = EllipticCurve(K, [0,-1,1,-10,-20])
sage: E.global_minimal_model()

Change History (8)

comment:1 Changed 11 years ago by cremona

I know. It has long been on my to-do list to implement a test for existence of a minimal model and give it if it exists. I convinced myself that this would be easy....

comment:2 Changed 9 years ago by jdemeyer

  • Milestone changed from sage-5.11 to sage-5.12

comment:3 Changed 9 years ago by vbraun_spam

  • Milestone changed from sage-6.1 to sage-6.2

comment:4 Changed 8 years ago by vbraun_spam

  • Milestone changed from sage-6.2 to sage-6.3

comment:5 Changed 8 years ago by vbraun_spam

  • Milestone changed from sage-6.3 to sage-6.4

comment:6 Changed 7 years ago by wuthrich

  • Status changed from new to needs_review

This can be closed as duplicate, since #18662 does exactly this is.

comment:7 Changed 7 years ago by chapoton

  • Milestone changed from sage-6.4 to sage-duplicate/invalid/wontfix
  • Reviewers set to Frédéric Chapoton
  • Status changed from needs_review to positive_review

comment:8 Changed 7 years ago by vbraun

  • Resolution set to fixed
  • Status changed from positive_review to closed
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