app_latex.tex

\begin{center}
\includegraphics[width=5cm]{images/latex/latex_humour}
\end{center}

%----------------------------
\subsection*{newcommand}

This features allows to define new commands which can then be used throughout the document. 
In {\filenamefont manual.tex} you will find

\begin{verbatim}
\newcommand{\K}{{\mathbb{K}}}
\newcommand{\Ranb}{{\mathsf{Ra}}}
\newcommand{\nineteeneightysix}{{\color{violet}\bf 1986}}
\end{verbatim}

which correspond to $\K$, $\Ranb$ and \nineteeneightysix.


%----------------------------
\subsection*{fullpage package}

How to extend margins for the whole document (such as this one):
\begin{verbatim}
\usepackage[cm]{fullpage}
\end{verbatim}


%----------------------------
\subsection*{siunitx package}

\begin{verbatim}
\usepackage{siunitx} 
\DeclareSIUnit\year{yr}
\end{verbatim}


%----------------------------
\subsection*{tikz}


\begin{verbatim}
\usetikzlibrary{arrows, arrows.meta}
\end{verbatim}


%----------------------------
\subsection*{include verbatim material inside a line}

\begin{verbatim}
\verb"git pull upstream master" and then eat an ice cream.
\end{verbatim}
results in
\verb"git pull upstream master" and then eat an ice cream.

%------------------------------
\subsection*{bibliography}

opla

\verb|\footfullcite|


%------------------------------
\subsection*{how to refer to a latex document from another document?}

This is the first latex file names {\tt manual.tex}. It contains sections and equations, all labelled.
\begin{verbatim}
\documentclass[a4paper]{book}
\begin{document}
\chapter{opla1} \label{ch1}
\section{meuh} \label{ss1}
\subsection{popo}
opla \ref{ch1} opla \ref{ss1}
\begin{equation}
\alpha= \beta \label{eq:one}
\end{equation}
\end{document}
\end{verbatim}

This second file will load the {\tt manual.aux} with the 'xr' package
and then all labels of that file are now available in this file:

\begin{verbatim}
\documentclass[a4paper]{article}
\usepackage{amsmath}

\usepackage{xr}
\externaldocument[MMM-]{manual}

\begin{document}

opla

the introduction to volume1 (\ref{MMM-ss1})
see \eqref{MMM-eq:one}

\end{document}
\end{verbatim}