Mathematical Sciences Classification System
78Axx - General
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                            78A02Foundations
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                            78A05Geometric optics
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                            78A10Physical optics
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                            78A15Electron optics
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                            78A20Space charge waves
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                            78A25Electromagnetic theory, general
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                            78A30Electro- and magnetostatics
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                            78A35Motion of charged particles
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                            78A37Ion traps
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                            78A40Waves and radiation
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                            78A45Diffraction, scattering [See also 34E20 for WKB methods]
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                            78A46Inverse scattering problems
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                            78A48Composite media; random media
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                            78A50Antennas, wave-guides
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                            78A55Technical applications
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                            78A57Electrochemistry
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                            78A60Lasers, masers, optical bistability, nonlinear optics [See also 81V80]
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                            78A70
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                            78A97Mathematically heuristic optics and electromagnetic theory (must also be assigned at least one other classification number in this section)
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                            78A99Miscellaneous topics