https://unimath.github.io/UniMath/gen/rocqdoc/UniMath.CategoryTheory.SetValuedFunctors.html
UniMath.CategoryTheory.SetValuedFunctors
https://leanprover-community.github.io/mathlib4_docs/Mathlib/CategoryTheory/Category/Factorisation.html
Mathlib.CategoryTheory.Category.Factorisation
mathlibcategoryfactorisation
https://math.iisc.ac.in/~gadgil/proofs-and-programs-2023/doc/Mathlib/CategoryTheory/Bicategory/Extension.html
Mathlib.CategoryTheory.Bicategory.Extension
mathlibextension