In the Dirichlet boundary value problem, a function \(u = u(x,y)\) is sought, which is a solution of the Laplace equation \(\Delta u = u_{xx} + u_{yy} = 0\) in a domain D and takes on given (boundary) values on the boundary of D. The solutions of the Laplace equation \(\Delta u = 0\) are the harmonic functions. These are precisely the real and imaginary parts of holomorphic functions.

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Harmonic Functions and the Dirichlet Boundary Value Problem

  • Christian Karpfinger

摘要

In the Dirichlet boundary value problem, a function \(u = u(x,y)\) is sought, which is a solution of the Laplace equation \(\Delta u = u_{xx} + u_{yy} = 0\) in a domain D and takes on given (boundary) values on the boundary of D. The solutions of the Laplace equation \(\Delta u = 0\) are the harmonic functions. These are precisely the real and imaginary parts of holomorphic functions.