Laplace's equation

noun
La·​place's equation | \ləˈplä|sə̇z-, -pla|\

Definition of Laplace's equation 

: the equation ∂2u/∂x2 + ∂2u/∂y2 + ∂2u/∂z2 = 0 often written ∇2u = 0 in which x, y, and z are the rectangular Cartesian coordinates of a point in space and u is a function of those coordinates

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History and Etymology for Laplace's equation

after Pierre Simon de Laplace †1827 French astronomer and mathematician

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