bold: \bf  deprectated for \textbf
italics: \it deprecated for \textit
newline: \\

\mathbb{W} set
\enskip 0.5 units spacing
\quad 1 unit spacing
\qquad 2 units spacing
\, spacing between "f(x) \, dx", separates letters without real spacing

Limes: $ \lim \limits_{x \to \infty} f(x) $

multiple conditions:
$$
  \lim \limits_{\substack{x \to x_0 \\ x < x_0}} f(x) = g_l
$$

Mapping: $ \zm{D} \to \zm{W} $

Math mode inline: $ a = b $
Math mode multiline (deprecated): $$ a = b $$
Math mode one line: \[ \] (short for {equation*})
Math mode multiline, alignment at '&' (lrlrlr…): \begin{array*} \end{array*}
Math mode multiline, alignment at '&' (ccc…): \begin{eqnarray*} line \nonumber \end{eqnarray\*}
Math mode bold: \boldmath$ 1 + 1$
Text in formula: $ \text{asdf} a = b $
Text over sign: $ a \overset{rule}{=} 1 $
Big braces: $ \Big( \Big) $ oder $ \left( \right)$
Tilde over sign: $ \widetilde{\phi} $
3 dots: $ \cdots $ (center) or $ \ldots $ (lower)
Braces below formula: $\underbrace{f'(x_0)}_{\text{derive inner function}}$
Alignment trick for multiple underbraces: $(\underbrace{x \vphantom{\ln(x)}}_{0} \cdot \underbrace{\ln(x)}_{-\infty})$

Big curly braces:
\[
f(x) = \begin{cases}
a & \text{if } a > 0 \\
0 & \text{if } a \leq 0
\end{cases}
\]

Big curly braces on both sides:
$
  \left.
  \begin{cases}
    f(x_0) > f(x) \\
    f(x_0) < f(x)
  \end{cases}
  \right\}
$.

Text left to a centered formula:
$$
  a = b
  \leqno \hbox{Also gilt:}
$$

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