# associative

### Arithmetic, Algebra

The operations of addition and multiplication of ordinary numbers are associative, meaning that if \(a\), \(b\), and \(c\) are numbers, then \((a+b)+c=a+(b+c)\) and \((a\times b)\times c=a\times (b\times c)\). This is not true of either subtraction or division. For instance, \((3-2)-1=0\) but \(3-(2-1)=2\).

### Abstract Algebra

There are many examples of abstract algebras that are not associative, for example Lie-algebras.

- [MLA] “associative.”
*Platonic Realms Interactive Mathematics Encyclopedia.*Platonic Realms, 25 Mar 2013. Web. 25 Mar 2013. <http://platonicrealms.com/> - [APA] associative (25 Mar 2013). Retrieved 25 Mar 2013 from the
*Platonic Realms Interactive Mathematics Encyclopedia:*http://platonicrealms.com/encyclopedia/associative/