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Some geometric aspects of wave motion: wavefront dislocations, diffraction catastrophes, diffractals. (English) Zbl 0437.73014
Geometry of the Laplace operator, Honolulu/Hawaii 1979, Proc. Symp. Pure Math. 36, 13-28 (1980).

MSC:
74J20 Wave scattering in solid mechanics
78A05 Geometric optics
58K35 Catastrophe theory