The Helmholtz equation, named for Hermann von Helmholtz, is the partial differential equation
where ∇2 is the Laplacian, k is the wavenumber, and A is the amplitude.
Read more about Helmholtz Equation: Motivation and Uses, Solving The Helmholtz Equation Using Separation of Variables, Paraxial Approximation, Inhomogeneous Helmholtz Equation
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