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Linear Wave Equations

  1. wtt = a2wxx.    Wave equation.
  2. wtt = a2wxx + Φ(x, t).    Nonhomogeneous wave equation.
  3. wtt = a2(wrr + r−1wr) + Φ(r, t).    Nonhomogeneous wave equation with axial symmetry.
  4. wtt = a2(wrr+2r−1wr) + Φ(r, t).    Nonhomogeneous wave equation with central symmetry.

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