1 \documentclass{article}

     2 \begin{document}

     3 This is my first LaTeX document. 

     4 \begin{equation}

     5   a^2 + b^2 = c^2 

     6 \end{equation}

     7 \[

     8 \begin{pmatrix}

     9 \alpha& \beta^{*}\\

    10 \gamma^{*}& \delta

    11 \end{pmatrix}

    12 \]

    13 \end{document}