Proof-relevant substitution principles for logical equivalence in CLL.
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logic
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- Lean
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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 around lines 354–359 and inspect subst_eqv_head and subst_eqv. Confirm how Proposition.equiv and Proposition.Equiv are represented, then add the requested accompanying theorem forms; done means both principles and their proof-relevant counterparts are defined consistently.
Written by the indexing model from the issue text.
Assessment
- Domain
- devtools
- Issue type
- Feature
- Difficulty
- 3/5
- Estimated time
- 1-2 days
- Activity status
- Stale
- Clarity
- Mostly clear
- Newbie friendliness
- 45/100