Question

what is singleton set​

Answer 1

Answer:

A singleton, also known as a unit set, is a set with exactly one element. For example, the set {null } is a singleton containing the element null. The term is also used for a 1-tuple.

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Answer 2

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what is singleton set

A singleton set is a set containing exactly one element.

for example

For example, {a}, {∅}, and { {a} } are all singleton sets (the lone member of { {a} } is {a}). The cardinality or size of a set is the number of elements it contains.