Formula
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\( s_n = \sum_{i=1}^{n} x_i \)
\[ s_n = \sum_{i=1}^{n} x_i \]
- \[ s_n = \sum_{i=1}^{n} x_i \]
\(
erfc(x) =
\frac{2}{\sqrt{\pi}} \int_x^{\infty} e^{-t^2}\,dt =
\frac{e^{-x^2}}{x\sqrt{\pi}}\sum_{n=0}^\infty (-1)^n \frac{(2n)!}{n!(2x)^{2n}}
\)
\(
x = \frac{1}{2}
\)
\( s_n = \sum_{i=1}^{n} x_i \)
