Die ganzen Zahlen hat der liebe Gott gemacht, alles andere ist Menschenwerk.

Layman learning a bit of math.

If you know how to improve my old answers or questions, please let me know!

Useful MathJax commands (\abs and \norm exist in physics package. Use \DeclarePairedDelimiter from mathtools package.)

\DeclareMathOperator{\E}{E}
\DeclareMathOperator{\Var}{Var}
\newcommand{\abs}[1]{\left\lvert #1 \right\rvert}
\newcommand{\norm}[1]{\left\lVert #1 \right\rVert}
\newcommand{\floor}[1]{\left\lfloor #1 \right\rfloor}

_{Request: Special commands for absolute value and norm}