Opened 3 years ago

Closed 3 years ago

#23191 closed enhancement (fixed)

default implementation of inverse_of_unit()

Reported by: saraedum Owned by:
Priority: minor Milestone: sage-8.0
Component: commutative algebra Keywords: sd86.5
Cc: Merged in:
Authors: Julian Rüth Reviewers: David Roe
Report Upstream: N/A Work issues:
Branch: baee716 (Commits) Commit: baee716de596637d075ae814ef45167b38ea95dd
Dependencies: Stopgaps:

Description (last modified by saraedum)

Not all ring elements provide inverse_of_unit() 

sage: R.<x> = ZZ[]
sage: S = R.quo(x^2 + x + 1)
sage: S(1).inverse_of_unit()
NotImplementedError

But we could always try to invert and see if the result is in the same parent.

Change History (8)

comment:1 Changed 3 years ago by saraedum

  • Branch set to u/saraedum/default_implementation_of_inverse_of_unit__

comment:2 Changed 3 years ago by saraedum

  • Authors set to Julian Rüth
  • Commit set to ac3c3f83077061875e2826e05e6789b8bdb8cdfc
  • Status changed from new to needs_review

New commits:

​ac3c3f8Add a default implementation of inverse_of_unit() for rings

comment:3 Changed 3 years ago by git

  • Commit changed from ac3c3f83077061875e2826e05e6789b8bdb8cdfc to 4c1dee458a94835c20ee6cec260bec9dcb29311b

Branch pushed to git repo; I updated commit sha1. This was a forced push. New commits:

​4c1dee4Add a default implementation of inverse_of_unit() for rings

comment:4 Changed 3 years ago by saraedum

  • Description modified (diff)

comment:5 Changed 3 years ago by roed

  • Branch changed from u/saraedum/default_implementation_of_inverse_of_unit__ to u/roed/default_implementation_of_inverse_of_unit__

comment:6 Changed 3 years ago by roed

  • Commit changed from 4c1dee458a94835c20ee6cec260bec9dcb29311b to baee716de596637d075ae814ef45167b38ea95dd
  • Status changed from needs_review to positive_review

I fixed a couple doctests (and ran all tests). Looks good.

New commits:

​baee716Add inverse_of_unit to list of methods in polynomial quotient ring

comment:7 Changed 3 years ago by jdemeyer

  • Reviewers set to David Roe

comment:8 Changed 3 years ago by vbraun

  • Branch changed from u/roed/default_implementation_of_inverse_of_unit__ to baee716de596637d075ae814ef45167b38ea95dd
  • Resolution set to fixed
  • Status changed from positive_review to closed
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