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\section{Magneto-Gravity Waves}  In the absence of a magnetic field, linear  incompressible adiabaticgravity  waves (appropriate for the radiative interior of a red giant)  obey the WKB dispersion relation \begin{equation}  \label{eqn:gravdisp}  \omega^2 - \frac{k_\perp^2}{k^2}N^2 = 0\, .