leanprover / leanprover/reference-manual
Universe unification and inference
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doc-request
- Dominant language
- Lean
- Stars
- 129
- Forks
- 67
- Avg merge
- 1d 15h
- Merged PRs (30d)
- 16
Description
What question should the reference manual answer?
What can I expect of the algorithm in Lean that assigns universe levels automatically? In particular, when is an inductive type a Prop?
Contributor guide
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
The issue asks the reference manual to explain Lean’s automatic universe-level assignment, including when an inductive type is Prop. Find the relevant manual section and define the expected algorithm and criteria; done when both questions are answered clearly and accurately.
Written by the indexing model from the issue text.
Assessment
- Domain
- documentation
- Issue type
- Documentation
- Difficulty
- 5/5
- Estimated time
- Over a week
- Activity status
- Stale
- Clarity
- Needs clarification
- Newbie friendliness
- 25/100