leanprover-community / leanprover-community/mathlib4

Porting note: change `rw` to `erw`

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porting-notes
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Description

Classifies porting notes claiming:

change rw to erw

Examples

https://github.com/leanprover-community/mathlib4/blob/ee3a8f2c586d4a63459a1993398767566acecfd8/Mathlib/AlgebraicGeometry/Pullbacks.lean#L269-L282

https://github.com/leanprover-community/mathlib4/blob/ee3a8f2c586d4a63459a1993398767566acecfd8/Mathlib/Geometry/RingedSpace/LocallyRingedSpace/HasColimits.lean#L216-L227

Contributor guide

Open the contributing guide

First steps

  1. Read the whole issue, then the project's contributing guide.
  2. Comment on the issue to say you are picking it up — it saves two people doing the same work.
  3. Fork the repository and make your change on a branch.
  4. Open a pull request that references the issue number.

Research direction

Start with the linked examples in Mathlib/AlgebraicGeometry/Pullbacks.lean and Mathlib/Geometry/RingedSpace/LocallyRingedSpace/HasColimits.lean, around the referenced lines, and inspect the surrounding porting changes. Determine which rw uses the note covers; the work is done when all applicable cases are identified and consistently handled.

Written by the indexing model from the issue text.

Assessment

Domain
compilers
Issue type
Refactor
Difficulty
3/5
Estimated time
1-2 days
Activity status
Stale
Clarity
Mostly clear
Newbie friendliness
35/100

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