from wave equation ∇2u(r,t) + 1/c2 (∂2u(r,t)/∂t2) = 0, get the Helmholtz equation. Using that u(r,t) = u(r)ei2πνt
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from wave equation ∇2u(r,t) + 1/c2 (∂2u(r,t)/∂t2) = 0, get the Helmholtz equation. Using that u(r,t) = u(r)ei2πνt
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