Some Problems Connected with the Laplacian

  • Robert D. Richtmyer
Part of the Texts and Monographs in Physics book series (TMP)


The Laplacian is in many respects of a more classical nature than many of the differential operators to be discussed in Chapters 10 and 11. One of the basic problems is to find the eigenfunctions u(x) of the equation 2 u + λu = 0 in a region Ω of n-dimensional space with the boundary condition w(x) = 0 on the boundary ∂Ω. For n = 2 that is the classical problem of a vibrating membrane. More generally, for both n = 2 and n = 3 the eigenfunctions and the variational methods that determine them are useful in problems of vibration, heat flow, electromagnetic fields, and hydrodynamic stability. That is the main subject of this chapter.


Vibration eigenfunctions in a bounded domain variational methods the Dirichlet integral the potential due to a given charge distribution Poisson’s equation convolutions the direct product Schwartz’s nuclear theorem the Cauchy-Riemann equations harmonic functions 


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Copyright information

© Springer-Verlag New York Inc. 1978

Authors and Affiliations

  • Robert D. Richtmyer
    • 1
  1. 1.Department of Physics and AstrophysicsUniversity of ColoradoBoulderUSA

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