unable to adjoin variables to a LocalRing
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- Dominant language
- Macaulay2
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- 435
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Description
A LocalRing object is not able to be used as the coefficient ring for a bigger polynomial ring.
Here is some code which reproduces the error:
```m2
needsPackage "LocalRings";
R=ZZ/101[x_1..x_4];
p=ideal(x_1..x_3);
S=R_p;
S[y]
```
And here is the error message:
```m2
stdio:3:1:(3): error: internal error: expected coefficient ring to have a base ring and a flat monoid
```
It would be nice to be able to do this for preserving grading in some cases.
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First steps
- Read the whole issue, then the project's contributing guide.
- Comment on the issue to say you are picking it up — it saves two people doing the same work.
- Fork the repository and make your change on a branch.
- Open a pull request that references the issue number.
Research direction
Start by running the reported LocalRings example that constructs S = R_p and then evaluates S[y], confirming the coefficient-ring error. Trace the LocalRing and polynomial-ring handling involved in that operation; done means a localized ring can serve as the coefficient ring for a larger polynomial ring while preserving grading as described.
Written by the indexing model from the issue text.
Assessment
- Domain
- tooling
- Issue type
- Bug
- Difficulty
- 4/5
- Estimated time
- 3-5 days
- Activity status
- Stale
- Clarity
- Mostly clear
- Newbie friendliness
- 35/100