INDEX 431 transition matrices, 340 version, 162 wave equation, 281 damped, 2, 7, 109–117 wavefront set classical, 190 for operators, 194 semiclassical, 188, 191, 192, 196 using FBI transform, 323 wedge product, 391 weight, 145 Weyl’s Law, 7, 132–137, 370 for harmonic oscillator, 123 on manifolds, 361–362 WKB approximation, xii, 227, 228, 273–274 Young’s inequality, 160
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