JetBrains / JetBrains/arend-lib
Show that the pullback of regular monomorphisms is their meet in the preorder of regular subojects
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help wanted
- Dominant language
- Java
- Stars
- 85
- Forks
- 23
- PR merge metrics
- No merged PRs in 30d
Description
This is [Category.Subobj/pullback_regularSubobj-isMeet](https://github.com/JetBrains/arend-lib/blob/4ea97da483c5bb2e6a22c8d09c03becf17756c7e/src/Category/Subobj.ard#L42).
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Research direction
Open src/Category/Subobj.ard at line 42 and read Category.Subobj/pullback_regularSubobj-isMeet together with the surrounding regular-subobject definitions. Determine the existing pullback and preorder lemmas needed, then prove the stated meet relationship in that file. Done means the theorem is accepted by the Arend checker.
Written by the indexing model from the issue text.
Assessment
- Domain
- tooling
- Issue type
- Feature
- Difficulty
- 4/5
- Estimated time
- 3-5 days
- Activity status
- Stale
- Clarity
- Clearly specified
- Newbie friendliness
- 35/100