The general dispersion relation of the linear waves and its reduced form in certain particular eases are obtained.
导出了非均匀等离子体中线性波的色散方程，并在一些特殊情况下进行了讨论。
The second example is the asymptotic periodic solution and the dispersion relation of weakly non-linear waves in a self-gravitating medium.
第二个实例是自引力介质中弱非线性波的渐近周期解及色散关系。
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