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a & = & a   1 \\
1 & = & 1   \frac{1}{a} \\
0 & = & \frac{1}{a} \\
a & = & \pm\infty
(\nabla_{xy}^2 n^2k^2)\psi-2ik(h\cdot\nabla)\psi=0

L_o(x,\vec{w}) = L_e(x, \vec{w})  
\int_\Omega f_r(x,\vec{w}',\vec{w})
L_i(x,\vec{w}')(\vec{w}'\cdot\vec{n})d\vec{w}'
{}_{y=\frac{d}{dx}f(x)}
\overline{a   b} &=& \rm{Re}(a)   \rm{Re}(b) - (\rm{Im}(a)   \rm{Im}(b)) \; i \\
&=& \rm{Re}(a) -  \rm{Im}(a) \; i   \rm{Re}(b) -  \rm{Im}(b) \; i \\
&=& \overline{a}   \overline{b}