The closure of a given set in a topological space is the smallest closed set containing the given set.
If \(F\) is a field, the algebraic closure of \(F\) is a field \(G\) containing \(F\) such that every polynomial with coefficients in \(F\) has a root in \(G\).
- [MLA] “closure.” Platonic Realms Interactive Mathematics Encyclopedia. Platonic Realms, 25 Mar 2013. Web. 25 Mar 2013. <http://platonicrealms.com/>
- [APA] closure (25 Mar 2013). Retrieved 25 Mar 2013 from the Platonic Realms Interactive Mathematics Encyclopedia: http://platonicrealms.com/encyclopedia/closure/