Opened 18 months ago

Closed 17 months ago

#20451 closed defect (fixed)

error in projective canonical height

Reported by: bhutz Owned by: bhutz
Priority: minor Milestone: sage-7.2
Component: algebraic geometry Keywords:
Cc: rlmiller Merged in:
Authors: Ben Hutz Reviewers: Rebecca Lauren Miller
Report Upstream: N/A Work issues:
Branch: b3212fa (Commits) Commit: b3212fa80172a6ef3b6b1c0cebe0cbe0c9a1737b
Dependencies: Stopgaps:

Description

The error bound for canonical height is not working in all cases. 

PS.<x,y>=ProjectiveSpace(1,QQ)
H=Hom(PS,PS)
f=H([16*x^2 -29*y^2,16*y^2]) #Poonen 3-cycle
Q=PS([-1/4,1])
Q.is_preperiodic(f)

is using error_bound = 0.01 and getting an error larger than 0.01

Change History (7)

comment:1 Changed 18 months ago by bhutz

  • Branch set to u/bhutz/ticket/20451
  • Commit set to b3212fa80172a6ef3b6b1c0cebe0cbe0c9a1737b
  • Status changed from new to needs_review

there were errors in two places. One with how resultant was called (and in resultant itself) with respect to normalization, and a problem with how the error bound was calculated.

New commits:

​b3212fa20451: fix error_bound for projective canonical height

comment:2 Changed 17 months ago by rlmiller

  • Cc rlmiller added

comment:3 Changed 17 months ago by rlmiller

  • Status changed from needs_review to positive_review

Looks good to me!

comment:4 Changed 17 months ago by vbraun

  • Status changed from positive_review to needs_work

Reviewer name is missing

comment:5 Changed 17 months ago by rlmiller

  • Reviewers set to Rebecca Lauren Miller

comment:6 Changed 17 months ago by rlmiller

  • Status changed from needs_work to positive_review

comment:7 Changed 17 months ago by vbraun

  • Branch changed from u/bhutz/ticket/20451 to b3212fa80172a6ef3b6b1c0cebe0cbe0c9a1737b
  • Resolution set to fixed
  • Status changed from positive_review to closed
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