Latex Useful Command Collection

LatexCommands.md

• bold math

  \mathbf{a}

  \bm{\alpha} // requires: \usepackage{bm}

• double line font (expectation, probability, real numbers)

\mathds{E},\mathds{P} // requires: \usepackage{dsfont}

• calligraphic font (set)

\mathcal{A}

• equation with alignment

\begin{equation}
  \begin{aligned}
  x &= 1 \\
  y &= 2
  \end{aligned}
\end{equation}

• Conditional function definition (with {)

f(x) = \left\{ 
\begin{array}{ll}
-\delta & x < 0 \\
x -\delta & x \ge 0
\end{array}
\right.

• argmin, argmax

Use one of the declarations

\DeclareMathOperator*{\argmin}{arg\,min} % thin space, limits underneath in displays
\DeclareMathOperator*{\argmin}{argmin} % no space, limits underneath in displays
\DeclareMathOperator{\argmin}{arg\,min} % thin space, limits on side in displays
\DeclareMathOperator{\argmin}{argmin} % no space, limits on side in displays

// requires: \usepackage{amsmath}

• numbered subequations

\begin{subequations}\label{eq:main}
    \begin{equation}\label{eq:main_cond1}
    x=1
    \end{equation}
    \begin{equation}\label{eq:main_cond2}
    x=2
    \end{equation}
    \begin{equation}\label{eq:main_cond3}
    x=3
    \end{equation}
\end{subequations}

• custom numbering // requires: \usepackage{enumitem}

\begin{enumerate}[label=P.\arabic*]
\item\label{item:1}
\end{enumerate}

• floor and ceiling functions

\documentclass{minimal}
\usepackage{mathtools}
\DeclarePairedDelimiter\ceil{\lceil}{\rceil}
\DeclarePairedDelimiter\floor{\lfloor}{\rfloor}

\begin{document}
  \begin{equation*}
    \floor*{\frac{x}{2}} < \frac{x}{2} < \ceil*{\frac{x}{2}}
  \end{equation*}
\end{document}