Opened 5 years ago

Closed 5 years ago

#18088 closed defect (fixed)

Inconsistency with 0^0

Reported by: kcrisman Owned by:
Priority: major Milestone: sage-6.7
Component: symbolics Keywords: pynac
Cc: Merged in:
Authors: Ralf Stephan Reviewers: Travis Scrimshaw
Report Upstream: Fixed upstream, in a later stable release. Work issues:
Branch: 4df15dd (Commits) Commit: 4df15dd3987bc77ef73177eb6a606a19f345fa1e
Dependencies: #18362 Stopgaps:

Description (last modified by rws)

See ​this ask.sagemath question. Apparently Ginac says zero to the zero is undefined but most of the rest of Sage (in accordance with IEEE) says it is one: 

sage: ZZ(0)^ZZ(0)
1

but 

sage: SR(0)^SR(0)
ValueError: power::eval(): pow(0,0) is undefined

Issue at ​https://github.com/pynac/pynac/issues/20

Change History (10)

comment:1 Changed 5 years ago by tmonteil

  • Component changed from basic arithmetic to symbolics
  • Description modified (diff)

comment:2 Changed 5 years ago by rws

  • Description modified (diff)
  • Keywords pynac added
  • Milestone changed from sage-6.6 to sage-6.7
  • Report Upstream changed from N/A to Reported upstream. Developers acknowledge bug.

comment:3 Changed 5 years ago by rws

  • Branch set to u/rws/inconsistency_with_0_0

comment:4 Changed 5 years ago by rws

  • Authors set to Ralf Stephan
  • Commit set to 4df15dd3987bc77ef73177eb6a606a19f345fa1e
  • Dependencies set to upcoming pynac-0.3.6
  • Report Upstream changed from Reported upstream. Developers acknowledge bug. to Fixed upstream, in a later stable release.
  • Status changed from new to needs_review

New commits:

​4df15dd18088: doctest for fix of pynac issue 20

comment:5 Changed 5 years ago by kcrisman

Should such tickets be "sage-pending", since the upcoming pynac isn't (yet) on a Sage ticket (or maybe it is since I last looked)? Just a procedure question, not a high priority question.

comment:6 Changed 5 years ago by rws

  • Milestone changed from sage-6.7 to sage-pending

comment:7 Changed 5 years ago by rws

  • Dependencies changed from upcoming pynac-0.3.6 to #18362

comment:8 Changed 5 years ago by rws

  • Milestone changed from sage-pending to sage-6.7

comment:9 Changed 5 years ago by tscrim

  • Reviewers set to Travis Scrimshaw
  • Status changed from needs_review to positive_review

LGTM.

comment:10 Changed 5 years ago by vbraun

  • Branch changed from u/rws/inconsistency_with_0_0 to 4df15dd3987bc77ef73177eb6a606a19f345fa1e
  • Resolution set to fixed
  • Status changed from positive_review to closed
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