Mathematicians sometimes use the word collection to denote a bunch of “things” without prejudice as to whether those things form a set, a proper class, or some other formal notion of collection. For example, the word is often used this way in the definition of a category.
Revision on September 6, 2009 at 21:14:10 by Mike Shulman See the history of this page for a list of all contributions to it.