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  • Modulus of a real number


    Modulus of a real number n is defined as

    \begin{aligned}
    |n| = =\begin{cases}n, & if & n > 0\\-n, & if & n > 0\end{cases}
    \end{aligned}

    For an example,
    |7| = 7 and |-7| = -(-7) = 7