x_(1,2)=(-b+-sqrt(b^2-4ac))/(2a)

x = {-b plus or minus square root of {b squared - 4ac}}/2a

INT_{0}^{INFTY}[ t^{x} e^{-t} {dt}/{t} ] = {1}/{x} PROD_{k = 1}^{INFTY}[{ (1 + {1}/{k}) ^{x}}/{ (1 + {x}/{k}) } ]

\[ \left( \array{1 & 0
0 & 1} \right)\]

\define{\at}{\tilde{\alpha}}
\define{\disc}[3]{\sqrt{#2^2 - 4 #1 #3}}
\at = \frac{-b \pm \disc{a}{b}{c}}{2a}