Proof-relevant substitution principles for logical equivalence in CLL.
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logic
- Dominant language
- Lean
- Stars
- 709
- Forks
- 200
- Avg merge
- 3d 6h
- Merged PRs (30d)
- 45
Description
subst_eqv_head and subst_eqv should be defined using Proposition.equiv first, and then
have accompanying theorems for Proposition.Equiv.
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
Open Cslib/Logics/LinearLogic/CLL/Basic.lean at lines 354-359 and inspect the existing subst_eqv_head and subst_eqv definitions. Confirm how Proposition.equiv and Proposition.Equiv are used nearby, then make the definitions use Proposition.equiv first and add the requested accompanying theorems for Proposition.Equiv. Done means both named principles and their theorems are present and consistent with the surrounding declarations.
Written by the indexing model from the issue text.
Assessment
- Domain
- tooling
- Issue type
- Refactor
- Difficulty
- 2/5
- Estimated time
- 1-3 hours
- Activity status
- Stale
- Clarity
- Clearly specified
- Newbie friendliness
- 55/100