Real Number

Number that, when written in decimal notation, is an unlimited decimal sequence periodic or not.

The symbol that represents the set of real numbers is the letter $\mathbb{R}$ .
The symbol that represents the set of real positive numbers is: $\mathbb{R}_{+}$ = {x ∈ $\mathbb{R}$ | x ≥ 0}
The symbol that represents the set of real negative numbers is: $\mathbb{R}_{–}$ = {x ∈ $\mathbb{R}$ | x ≤ 0}
The symbol that represents the set of the non-zero real numbers is: $\mathbb{R}{^*}$ = {x ∈ $\mathbb{R}$ | x ≠ 0}
The symbol that represents the set of strictly positive real numbers is: $\mathbb{R}_{+}^{*}$ = {x ∈ $\mathbb{R}$ | x > 0}
The symbol that represents the set of strictly negative real numbers is: $\mathbb{R}_{–}^{*}$ = {x ∈ $\mathbb{R}$ | x < 0}

The set $\mathbb{R}$ of real numbers appears in this Venn diagram:

Try Buzzmath activities for free