rank fails over ZZ because codim needs Generic => true
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Description
The problem is that there's no way to pass Generic => true to codim via rank.
i1 : R = ZZ[x];
i2 : rank coker vars R
stdio:2:4:(3): error: codim: expected an affine ring (consider Generic=>true to work over QQ)
i3 : options rank
i4 : options \ methods rank
o4 = {0 => null}
{1 => null}
{2 => null}
{3 => null}
{4 => null}
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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 tracing the rank command and its calls to codim, then inspect the options shown for rank and the reported Generic option. Reproduce the ZZ[x] example and verify that rank can forward Generic => true so rank coker vars R succeeds over the non-affine ring.
Written by the indexing model from the issue text.
Assessment
- Domain
- tooling
- Issue type
- Bug
- Difficulty
- 3/5
- Estimated time
- 1-2 days
- Activity status
- Quiet
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- Mostly clear
- Newbie friendliness
- 48/100