== Examples == Harmonic functions that arise in physics are determined by their singularities and boundary conditions (such as Dirichlet boundary conditions or Neumann boundary conditions). On regions without boundaries, adding the real or imaginary part of any entire function will produce a harmonic function with the same singularity, so in this ...
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mathematical function of two variables having the property that its value at any point is equal to the average of its values along any circle around ... [2 related articles]
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http://www.britannica.com/eb/a-z/h/18
A function that is a solution to Laplace's equation. Harmonic functions are important in the areas of applied mathematics, engineering, and mathematical physics. They are used, for example, to solve problems involving steady state temperatures, two-dimensional electrostatics, and ideal fluid flow.
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