Question: Theorem 2.7 The solution to the initial value problem ( utt c2(uxx + uyy + uzz ) = 0 u(x, y, z, 0) = (x,

Theorem 2.7 The solution to the initial value problem ( utt c2(uxx + uyy + uzz ) = 0 u(x, y, z, 0) = (x, y, z), ut(x, y, z, 0) = (x, y, z). (2.18) is u(x0, y0, z0, t0) = 1 4c2t0 Z Z S (x, y, z)dS + t0 1 4c2t0 Z Z S (x, y, z)dS , explain the proof

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