# almost everywhere

A condition is said to hold *almost everywhere* on a measurable set \(X\) if the subset \(N\) of elements of \(X\) on which the condition does not hold has measure zero, *i.e.*, if \(N\) is a null set.

- [MLA] “almost everywhere.”
*Platonic Realms Interactive Mathematics Encyclopedia.*Platonic Realms, 21 Feb 2013. Web. 21 Feb 2013. <http://platonicrealms.com/> - [APA] almost everywhere (21 Feb 2013). Retrieved 21 Feb 2013 from the
*Platonic Realms Interactive Mathematics Encyclopedia:*http://platonicrealms.com/encyclopedia/almost-everywhere/