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\overline{a * b} &=& \rm{Re}(a) \rm{Re}(b) - \rm{Im}(a)\rm{Im}(b) - (\rm{Re}(a) \rm{Im}(b)   \rm{Re}(b) \rm{Im}(a)) \; i \\
&=& \overline{a} * \overline{b}
L(\vec{x},\vec{\omega}) = L_e   \int_\Omega f_r(\vec{\omega}, \vec{\omega}') \>
L_i(\vec{x},\vec{\omega}') \> (\vec{N}\cdot \vec{\omega'}) \; d \vec{\omega}'
\left\{ \begin{array}{rcrcr}
2x &   & 5y & = & -3 \\
3x &   & y & = & 2
\end{array} \right.
A=\sqrt{B C}
{\lambda \choose n}=\frac{\lambda(\lambda-1)(\lambda-2)\cdots(\lambda-n 1)}{n!}\ ,\ \ {\lambda \choose 0}=1