bug in Module / Module
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- Dominant language
- Macaulay2
- Stars
- 435
- Forks
- 297
- Avg merge
- 4d 20h
- Merged PRs (30d)
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Description
I believe this should be an error:
```m2
i1 : R = kk[x];
i2 : M = module ideal x^2;
i3 : N = comodule ideal x^2;
i4 : M / N
o4 = cokernel | 1 |
1
o4 : R-module, quotient of R
```
N is not a submodule of M, and they're not submodules of the same module either for `(M+N)/N` to make sense. The output doesn't even make sense as vector spaces, since M is the span of {x^2, x^3, ...} and N is the span of {1, x}.
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Research direction
Reproduce the displayed Macaulay2 commands involving M = module ideal x^2, N = comodule ideal x^2, and M / N. The issue provides no file or test path; done means the invalid quotient is rejected with an error because N is not a submodule of M or of the same ambient module.
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