Freeflows

Sign Function Summation

The sign function $ \text{sgn}(x) $ is defined by \[\text{sgn}(x) = \left\{ \begin{aligned} -1 \quad &\text{if } x < 0 \\ 0 \quad &\text{if } x = 0 \\ 1 \quad &\text{if } x > 0.\end{aligned} \right.\]Compute $ \sum_{n=-10}^{20} \text{sgn}(n) $.

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$\frac{a}{b}$
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0
=
%

$a^n$
$a^{\circ}$
$a_n$
$\sqrt{}$
$\sqrt[n]{}$
$\pi$
$\ln{}$
$\log$
$\theta$
$\sin{}$
$\cos{}$
$\tan{}$

$($
$)$
$[$
$]$
$\cap$
$\cup$
$,$
$\infty$

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