Latex piecewise function

Saturday 14 December 2019, by Nadir Soualem

amsmath cases function Latex piecewise

\usepackage{amsfonts}

\begin{equation*}
y = f(x) = \lvert x \rvert = \left\{
        \begin{array}{ll}
            -x & \quad x \leq 0 \\
            x & \quad x \geq 0
        \end{array}
    \right.
\end{equation*}

\begin{equation*}
g(x)=\begin{cases}
          x \quad &\text{if} \, x \in \mathbb{Q} \\
          -x \quad &\text{if} \, x \notin \mathbb{Q} \\
     \end{cases}
\end{equation*}

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