Difference between revisions of "Element"

m
Line 14: Line 14:
 
*[[Cardinality]]
 
*[[Cardinality]]
 
*[[Set theory]]
 
*[[Set theory]]
 +
 +
[[Category:Set Theory]]

Revision as of 09:19, 27 May 2008

This article is a stub. Help us out by expanding it.

An element, also called a member, is an object contained within a set or class.

$A=\{1,\,2,\,3,\,4\}$ means set $A$ contains the elements 1, 2, 3 and 4.

To show that an element is contained within a set, the $\in$ symbol is used. The opposite of $\in$ is $\notin$, which means the element is not contained within the set.

Sets as Elements

Elements can also be sets. For example, $B = \{1,\,2,\,\{3,\,4\}\}$. The elements of $B$ are $1$, $2$, and $\{3,\,4\}$.

See Also