Real number

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A real number is a number that can be described by an infinite (or shorter) sequence of decimals. Denoted by the symbol $\mathbb{R}$ .

[edit] Values belonging to the classification of real numbers

-7
9.27
$\sqrt{2} \approx 1.41421356...$
$\pi \approx 3.14159265...$

[edit] Values not belonging to the classification of real numbers

$\sqrt{-1}$

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