${=}$
${\neq}$
${\simeq }$
${\leq}$
${\geq}$

${\Rightarrow}$
${\Leftrightarrow}$

${\varnothing }$
${\mathbb{N}}$
${\mathbb{Z}}$
${\mathbb{Q}}$
${\mathbb{R}}$
${\mathbb{C}}$

${\subset}$
${\in}$
${\notin}$
${\exists} $
${\forall}$

${\cap} $
${\cup}$

${\binom{n}{k}} $

${\binom{n}{k}}=\frac{n!}{k!(n-k)!}$
$Z={\frac{x-\mu}{\sigma}}$

${f: x \mapsto f(x)}$

${\lim_{x\rightarrow 0}}$
${\lim_{x\rightarrow a}}$
${\lim_{x\rightarrow +\infty}}$
${\lim_{x\rightarrow -\infty}}$

${\int}$
${\int_{a}^{a}}$

${U_{n}}$
${U_{n+1}}$
${\sum }$
${\sum_{i=0}^n}$

${\lim_{n \to +\infty}}$

${\perp }$
${\parallel}$

${\widehat{ABC}}$

${\cdot}$
${\underset{u}{\rightarrow}}$
${\overrightarrow{AB}}$