Editing Singleton Set (section)

= Singleton Set - Definition and Examples =

A '''singleton set''' is a special type of set that contains '''only one element'''. It is the smallest possible non-empty set in set theory.

== Definition of a Singleton Set ==

A set that has '''exactly one element''' is called a '''singleton set'''. It is also known as a '''unit set'''.

* In mathematical notation:
<math>A = \{a\}</math> is a singleton set, because it contains only one element, '''a'''.

== Characteristics of Singleton Sets ==

* Contains '''exactly one element'''.
* Is a '''finite set'''.
* The number of elements (cardinality) is:
<math>n(A) = 1</math>
* Every singleton set is a '''subset''' of itself and other sets that include the same element.

== Examples of Singleton Sets ==

=== Example 1: ===
<math>A = \{7\}</math>  
'''This is a singleton set with one element, 7.'''

=== Example 2: ===
<math>B = \{\text{India}\}</math>  
'''This set contains only one country name.'''

=== Example 3: ===
The set of natural numbers less than 2 and greater than 0:
<math>C = \{1\}</math>  
'''Only one natural number satisfies this condition, so the set is singleton.'''

=== Example 4: ===
Let D be the set of solutions to the equation <math>x^2 = 1</math> in natural numbers:
<math>D = \{1\}</math>  
'''Since only 1 is a natural number solution, D is a singleton set.'''

== Difference Between Singleton and Empty Set ==

{| class="wikitable"
! Property !! Singleton Set !! Empty Set
|-
| Number of Elements || Exactly 1 || 0
|-
| Example || <math>\{5\}</math> || <math>\emptyset</math>
|-
| Finite? || Yes || Yes
|-
| Subset of Other Sets? || Yes || Yes
|}

== Importance of Singleton Sets ==

* Useful in identifying specific outcomes in '''probability''' and '''statistics'''.
* Important in defining '''functions''' and '''relations'''.
* Forms the basis of understanding the concept of '''cardinality''' in set theory.

== Conclusion ==

A '''singleton set''' is a set that contains just '''one element'''. It is an important type of finite set in mathematics and helps students grasp the idea of set size and structure. Knowing about singleton sets is essential for understanding more complex topics in mathematics.

[[Category:Set Theory]]
[[Category:Mathematics Class 10]]
[[Category:Mathematics Class 12]]
[[Category:Types of Sets]]