Mathematical Sciences Classification System
74Jxx - Waves
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                            74J05Linear waves
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                            74J10Bulk waves
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                            74J15Surface waves
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                            74J20Wave scattering
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                            74J25Inverse problems
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                            74J30Nonlinear waves
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                            74J35Solitary waves
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                            74J40Shocks and related discontinuities
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                            74J99None of the above, but in this section