Closure

Closure is a property of an abstract algebraic structure, such as a set, group, ring, or field

Definition

An algebraic structure $\mathbb{S}$ is said to have closure in a binary operation $\times$ if for any $a,b\in \mathbb{S}$ , $a\times b\in \mathbb{S}$ . In words, when any two members of $\mathbb{S}$ are combined using the operation, the result also is a member of $\mathbb{S}$ .

Examples

The real number system $\mathbb{R}$ has closure in addition, subtraction, multiplication, division, exponentation, and also higher level operations such as $a \uparrow \uparrow b$ .
The rational number system $\mathbb{Q}$ has closure in addition, subtraction, multiplication, and division
The natural and whole number system $\mathbb{Z}^+,\mathbb{Z}^0$ has closure in addition and multiplication.
The complex number system $\mathbb{C},\mathbb{Z}^0$ has closure in addition and subtraction.

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Closure

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