Category (disambiguation)
From Citizendium, the Citizens' Compendium
(Redirected from Category)
This disambiguation page lists articles associated with the same title.
- Category (philosophy) [r]: Add brief definition or description
- Category theory [r]: Loosely speaking, a class of objects and a collection of morphisms which act upon them; the morphisms can be composed, the composition is associative and there are identity objects and rules of identity. [e]
- First category space [r]: A topological space which is a countable union of nowhere dense subsets; a meagre space. [e]
- Second category space [r]: A topological space which is not the countable union of nowhere dense subsets; a space which is not of first category. [e]
