Hom between modules over different rings
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- Dominant language
- Macaulay2
- Stars
- 435
- Forks
- 297
- Avg merge
- 4d 20h
- Merged PRs (30d)
- 11
Description
Currently the implementation of Hom(M, N) convert both modules to the same ring in an ambiguous way, causing incorrect results:
```m2
i1 : K = ZZ/11;
i2 : S = K[x,y];
i4 : Hom(S^1, K^1)
1
o4 = S
o4 : S-module, free
i5 : Hom(S^1, coker vars S)
o5 = cokernel | y x |
1
o5 : S-module, quotient of S
```
Contributor guide
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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
No source file, test, or entry point is named. Start by reproducing the provided Macaulay2 session comparing Hom(S^1, K^1) and Hom(S^1, coker vars S), then trace how modules over different rings are converted; done means the conversion is unambiguous and both results are mathematically correct.
Written by the indexing model from the issue text.
Assessment
- Domain
- tooling
- Issue type
- Bug
- Difficulty
- 5/5
- Estimated time
- Over a week
- Activity status
- Stale
- Clarity
- Needs clarification
- Newbie friendliness
- 25/100