If \(X\) is a set with a topology, then an element \(p\) of \(X\) is said to be an accumulation point of \(X\) if every open subset of \(X\) containing \(p\) also contains elements of \(X\) distinct from \(p\).
- [MLA] “accumulation point.” Platonic Realms Interactive Mathematics Encyclopedia. Platonic Realms, 19 Mar 2013. Web. 19 Mar 2013. <http://platonicrealms.com/>
- [APA] accumulation point (19 Mar 2013). Retrieved 19 Mar 2013 from the Platonic Realms Interactive Mathematics Encyclopedia: http://platonicrealms.com/encyclopedia/accumulation-point/