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Recently Referred Formulae

(\nabla_{xy}^2+n^2k^2)\psi-2ik(h\cdot\nabla)\psi=0
Ackermann Function
{\rm Ack}(m,n)=\begin{cases} n+1, & \mbox{if}~m=0\\ {\rm Ack}(m-1,1), & \mbox{if}~n=0\\ {\rm Ack}(m-1,{\rm Ack}(m, n-1)), & \mbox{otherwise}\\ \end{cases}
The rendering equation
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}' \ .
S
P=v^n \cdot S