Opened 3 years ago

Closed 18 months ago

#22071 closed defect (wontfix)

Expression._latex_() triggers “dangerous” comparisons

Reported by: mmezzarobba Owned by:
Priority: minor Milestone: sage-duplicate/invalid/wontfix
Component: symbolics Keywords:
Cc: rws Merged in:
Authors: Reviewers:
Report Upstream: N/A Work issues:
Branch: Commit:
Dependencies: Stopgaps:

Description

With commit a5a1e2b76332d136936c7cbe94cf42f93ec6203d from ticket #22029: 

sage: Mod(2,7)/x
2/x
sage: latex(Mod(2,7)/x)
...
TypeError: unsupported operand parent(s) for 'lt': 'Ring of integers modulo 7' and 'Number Field in I with defining polynomial x^2 + 1'

It looks like Pynac is comparing the numerator with I under the hood. Even if the branch in question isn't merged, this is likely to cause problems sooner or later.

Change History (4)

comment:1 Changed 2 years ago by rws

Note there is a consensus that operations with positive characteristic ring elements and symbolic variables should be discouraged (leading to #21391). Consequently the latexing will fail as well as soon as that is implemented, and you would need something like #10035 to make it work. That doesn't fix this specific odd error but it lowers the urgency level I'm personally having with it.

comment:2 Changed 2 years ago by rws

  • Milestone changed from sage-7.5 to sage-duplicate/invalid/wontfix
  • Status changed from new to needs_review

Seems to be no longer an issue.

comment:3 Changed 19 months ago by chapoton

  • Status changed from needs_review to positive_review

comment:4 Changed 18 months ago by embray

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