This page is a stub
This page is a stub, so it contains little or minimal information and is on a to-do list
for being expanded.The message provided is:
Needs references and such, to make it as nice as the category
This page is a dire page and is in desperate need of an update.
A subcategory is a category who's objects and morphisms/arrows are a subset (subclass for certain kinds of category) of those in the "parent" category. Same as every other sub(object).