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# accumulation point

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 $$p$$.

Citation Info

• [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/