yark, James Pascaleff, matte. "set difference" (version 29). PlanetMath.org. Freely available at http://planetmath.org/SetDifference.html.

AMS MSC:

03E20 (Mathematical logic and foundations :: Set theory :: Other classical set theory (including functions, relations, and set algebra))

NS:published, NS:Section:Reference

for example by Aaron Krowne on 2001-11-17 10:44:36 Often one will see \mathbb{Z} \ {0} to mean "integers except zero", etc -apk [ reply | up ]