leanprover-community / leanprover-community/mathlib4
Slow unification of `ContinuousLinearMap.comp (ContinuousLinearMap.adjoint)` and `star *`
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Description
In Mathlib.Analysis.InnerProductSpace.Unitary, unitary.star_mul_self_of_mem hu for (hu : u ∈ unitary (H →L[𝕜] H)) elaborates slowly thanks to slow unification checks [1.068378s] ✅ ContinuousLinearMap.comp (ContinuousLinearMap.adjoint u) u =?= star ?a * ?b.
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Research direction
Start in Mathlib.Analysis.InnerProductSpace.Unitary and inspect unitary.star_mul_self_of_mem hu for u ∈ unitary (H →L[𝕜] H). Reproduce the elaboration and examine the slow unification check between ContinuousLinearMap.comp (ContinuousLinearMap.adjoint u) u and star ?a * ?b. Done means the theorem elaborates without the reported slow unification delay.
Written by the indexing model from the issue text.
Assessment
- Domain
- performance
- Issue type
- Bug
- Difficulty
- 4/5
- Estimated time
- 3-5 days
- Activity status
- Stale
- Clarity
- Mostly clear
- Newbie friendliness
- 35/100