Difference between revisions of "Element"
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<math>A=\{1,\,2,\,3,\,4\}</math> means set <math>A</math> contains the elements 1, 2, 3 and 4. | <math>A=\{1,\,2,\,3,\,4\}</math> means set <math>A</math> contains the elements 1, 2, 3 and 4. | ||
| − | To show that an element is contained within a set, the <math>\in</math> symbol is used. If <math>A=\{2,\,3\}</math>, then <math>2\in A</math>. | + | To show that an element is contained within a set, the <math>\in</math> symbol is used. If <math>A=\{2,\,3\}</math>, then <math>2\in A</math>. The opposite of <math>\in</math> is <math>\notin</math>, which means the element is not contained within the set. |
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| − | The opposite of | ||
=== Sets as Elements === | === Sets as Elements === | ||
Revision as of 14:50, 16 April 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.
means set 
contains the elements 1, 2, 3 and 4.
To show that an element is contained within a set, the 
symbol is used. If 
, then 
. The opposite of is 
, which means the element is not contained within the set.
Sets as Elements
Elements can also be sets. For example, 
. The elements of 
are 
, 
, and 
.
