Set (mathematics): Difference between revisions
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imported>Alireza Nejati (Created this page and added a short stub.) |
imported>Alireza Nejati (Added See Also section.) |
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In [[mathematics]], a '''set''' can be thought of as any collection of distinct objects considered as a whole. | In [[mathematics]], a '''set''' can be thought of as any collection of distinct objects considered as a whole. | ||
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:''A'' = {2, 3, 4, 5, 6, 7, 8, 9} | :''A'' = {2, 3, 4, 5, 6, 7, 8, 9} | ||
==See Also== | |||
* [[Set theory]] | |||
* [[Mathematics]] | |||
Revision as of 08:09, 28 March 2007
In mathematics, a set can be thought of as any collection of distinct objects considered as a whole.
Despite this intuitive definition, a set cannot be defined in terms of other mathematical definitions, thus it is generally accepted that a set is an 'undefined' entity. Because of this property, sets are fundamental structures in mathematics.
Notation
Sets can be denoted by a list of objects separated with commas, enclosed with curly brackets. For example, {1, 2, 3} is the set of the numbers 1, 2, and 3. We say that 1, 2, and 3 are its members.
There are many other ways to write out sets. For example,
- A = {x | 1 < x < 10, x is a natural number}
Can be read as follows: A is the set of all x, where x is between 1 and 10, and x is a natural number. A could also be written as:
- A = {2, 3, 4, 5, 6, 7, 8, 9}