    % All commands which have more than one argument
    % can be used in the following three ways:

    \begin{bf}
    Some text.
    \end{bf}

    \bf{Some text.}

    {\bf Some text.}

    % With the third method, it is important that the
    % command has its own pair of braces, and that
    % the command immediately follows the first brace.
    % Otherwise, the parser cannot parse the argument(s)
    % properly. With multiple arguments,
    % each should be enclosed in braces.
    % Optional arguments are specified using square brackets or parentheses.
    % Whitespace should be avoided between command names and their arguments.

    % A mathematical formula:
    \begin{split}
      Q &= \int_{\nu} \rho_{\nu}\, d \nu \\
        &= \int_0^4 \int_0^{\frac{\pi}{2}} \int_0^2 3(z+1) \cos \phi \, d\rho \, d\phi \, dz \, \mu C \\
        &= \int_0^4 \int_0^{\frac{\pi}{2}} 6 (z+1) \cos \phi \,d\phi \,dz \,\mu C \\
        &= \int_0^4 6 (z+1) \,dz \,\mu C \\
        &= \frac{6z^2}{2} + 6z \Bigg|_0^4 \,\mu C \\
        &= 3(16) + 6(4) \,\mu C \\
        &= 72 \,\mu C
    \end{split}

    % Nested commands:
    {\em This sentence is {\em emphasized}, with emphasis on the word {\em emphasized}.}