where ∇2 is the Laplacian In mathematics and physics, the Laplace operator or Laplacian, denoted by or and named after Pierre-Simon de Laplace, is a differential operator, specifically an important case of an elliptic operator, with many applications. In physics, it is used in modeling of wave propagation, heat flow and forming the Helmholtz equation. It is central in, k is the wavenumber, and A is the amplitude.

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