singleton
set theory
Quick Summary
In set theory, a singleton is a set containing exactly one element. For example, the set {5} is a singleton, as it has only one member. The empty set, denoted by {} or Ø, is not a singleton because it contains no elements. Sets are fundamental in mathematics and logic, representing collections of objects, which can be numbers, functions, or other items. These objects are called elements, and their membership in a set is indicated by symbols like '∈' (is an element of) and '∉' (is not an element of).12
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