Getting R, N etc for number sets . $\mathbb{R}$
Accents in _tabbing_ environment : \a' for acute accent, \a` for grave accent, \a= for macron accent
To get neat summations etc. \sum_{\substack{i < j \\ k < l}} i+j+k+l
Side by side tables use \minipage and then \tabbing
To declare new math operators \DeclareMathOperator (\DeclareMathOperator*) if
it has limits.
\renewcommand{\theequation}{\alph{equation}} - Makes equation numbered by
alphabetical letters, also \roman, \Roman, \arabic
\renewcommand{\thesection}{\arabic{section}} - Makes section numbered arabic
Use \citet, \citep to get citations of the form (Jones et al. 1607). or Jones
et al. (1607).
For getting colours, in latex: \usepackage{color}, then \color{red}