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Numerical wave propagation (2)
The complete scheme,
\lbrack D_tD_t e^{ikx}e^{-i\tilde\omega t} = c^2D_xD_x e^{ikx}e^{-i\tilde\omega t}\rbrack^n_q
leads to an equation for \tilde\omega :
\sin^2\left(\frac{\tilde\omega\Delta t}{2}\right)
= C^2\sin^2\left(\frac{k\Delta x}{2}\right),
where C = \frac{c\Delta t}{\Delta x} is the Courant number
