algebra.category
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Development of Category Theory. The following files are in this folder (sorted such that files only import previous files).

* [precategory](precategory.hlean)
* [iso](iso.hlean) : iso, mono, epi, split mono, split epi
* [category](category.hlean) : Categories (i.e. univalent or Rezk-complete precategories)
* [groupoid](groupoid.hlean)
* [functor](functor/functor.md) (subfolder) : definition and properties of functors
* [strict](strict.hlean) : Strict categories
* [nat_trans](nat_trans.hlean) : Natural transformations
* [constructions](constructions/constructions.md) (subfolder) : basic constructions on categories and examples of categories
* [limits](limits/limits.md) (subfolder) : Limits and colimits in precategories