Ecuación de Christoffel

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(kris’ tof ∂l)Una forma de la ecuación de ondas para ondas planas usadas para calcular superficies de velocidad y lentitud:

,

where is wavenumber, is the direction cosine matrix, C is the stiffness tensor, u the particle displacement vector, the density, and the angular frequency. The quantity in parentheses is called the Christoffel matrix.