http://www2.isye.gatech.edu/~nemirovs/ICMNemirovski.pdf

www2.isye.gatech.edu/~nemirovs/Lect_ModConvOpt.pdf

http://en.wikipedia.org/wiki/Partially_ordered_set

http://www.olivierdubois.info/projects/CompGeo/project/APPLET/applet.html

http://www2.isye.gatech.edu/~nemirovs/ICMNemirovski.pdf

http://www2.isye.gatech.edu/~nemirovs/ICMNemirovski.pdf

http://www2.isye.gatech.edu/~nemirovs/Lect_ModConvOpt.pdf

http://www2.isye.gatech.edu/~nemirovs/ICMNemirovski.pdf

Informally speaking, is a limit point of A if there are points in A that are different from but arbitrarily close to it

http://www.cse.iitb.ac.in/~cs709/notes/eNotes/ExtraProblems-1.pdf