Talk:Topology/Basic Concepts Set Theory

can the "Ordered sets are really just a short notation for certain unordered sets" idea be expounded on? I dont understand the equation that follows


 * I've done this. I'm not really sure why this comment is even present, however - it really belongs to set theory, not topology... J Bytheway 19:35, 28 Jan 2005 (UTC)

Can we get the answers to the questions?

Complement of A
"In contexts where there is a set containing "everything," usually denoted U, the complement of A, denoted Ac, is A\U."

Shouldn't it be "U\A"? --SolVolkov (discuss • contribs) 21:40, 20 April 2013 (UTC)