Helmholtz equationSee also what's at Wikipedia, your library, or elsewhere.
Broader terms:Narrower term:Used for: Reduced wave equation
 Wave equation, Reduced

Filed under: Helmholtz equation Frequency dependence of sound transmitted from an airborne source into the ocean (Naval Postgraduate School, 1972), by Herman Medwin and R. A Helbig (page images at HathiTrust; US access only)
 On Helmholtz's theorem in finite regions (Midwestern Universities Research Association, 1958), by J. van Bladel, U.S. Atomic Energy Commission, and Midwestern Universities Research Association (page images at HathiTrust)
 Homogeneity of the magnetic field of a Helmholtz coil (Albuquerque, New Mexico : Sandia Corporation, Technical Information Division ; Washington, D.C. : Available from the Office of Technical Services, Dept. of Commerce, 1960., 1960), by Kenneth D. Granzow, U.S. Atomic Energy Commission, and Sandia Corporation (page images at HathiTrust)
 Noniterative solution of a boundary value problem of the Helmholtz type (Air Force Cambridge Research Laboratories, *c [1969], 1969), by Samuel Y. K. Yee and Air Force Cambridge Research Laboratories (U.S.) (page images at HathiTrust; US access only)
 Noniterative solution of a boundary value problem of the Helmholtz type (L. G. Hansom Field, Bedford, Massachusetts : Air Force Cambridge Research Laboratories, Office of Aerospace Research, United States Air Force, 1969., 1969), by Samuel Y. K. Yee and Air Force Cambridge Research Laboratories (U.S.) (page images at HathiTrust)
Filed under: Helmholtz equation  Numerical solutions
Items below (if any) are from related and broader terms.
Filed under: Differential equations, Elliptic Existence, Multiplicity, Perturbation, and Concentration Results for a Class of QuasiLinear Elliptic Problems (EJDE monograph #7, 2006), by Marco Squassina (PDF with commentary at ams.org)
 PalaisSmale Approaches to Semilinear Elliptic Equations in Unbounded Domains (EJDE monograph #6, 2004), by Hwaichiuan Wang (PDF with commentary at ams.org)
 A probabilistic study of linear ellipticparabolic equations of second order (Dept. of Pure Mathematics, [School of General Studies] and Dept. of Mathematics, IAS, Australian National University, 1979), by Iain Johnstone (page images at HathiTrust)
 Ueber die elliptischen und die hyperbolischen ConoCunei (Druck von Joh. Aug. Koch, 1884), by Carl Pabst (page images at HathiTrust)
 Conjugate quasilinear Dirichlet and Neumann problems and a posteriori error bounds (U.S. National Aeronautics and Space Administration ;, 1976), by John E. Lavrey, United States National Aeronautics and Space Administration, and Goddard Space Flight Center (page images at HathiTrust)
 NASA TN D1711 (National Aeronautics and Space Administration, 1963), by Vladimir Hamza, Lewis Research Center, and United States National Aeronautics and Space Administration (page images at HathiTrust; US access only)
 Iterative methods for solving elliptictype differential equations with application to twospacedimension multigroup analysis (Knolls Atomic Power Laboratory ;, 1955), by Eugene L. Wachspress, Knolls Atomic Power Laboratory, and U.S. Atomic Energy Commission (page images at HathiTrust)
 Symmetric successive overrelaxation in solving diffusion difference equations (Knolls Atomic Power Laboratory, General Electric Company, 1959), by G. J. Habetler, B. D. Baldwin, Eugene L. Wachspress, U.S. Atomic Energy Commission, General Electric Company, and Knolls Atomic Power Laboratory (page images at HathiTrust)
 Concerning the implicit alternatingdirection method (Knolls Atomic Power Laboratory, General Electric Company, 1959), by G. J. Habetler, U.S. Atomic Energy Commission, General Electric Company, and Knolls Atomic Power Laboratory (page images at HathiTrust)
 Estimation of error for nonlinear elliptical differential equations. ([Washington, D.C.] : Air Force Office of Scientific Research, Air Research and Development Command, United States Air Force, 1957., 1957), by Alfred Meyer and United States. Air Force. Office of Scientific Research (page images at HathiTrust)
 Uniqueness of mapping pairs for elliptic equations (Washington D. C. : Mathematics Division, Office of Scientific Research, U.S. Air Force, 1956., 1956), by R. M. McLeod, F. G. Dressel, J. J. Gergen, United States. Air Force. Office of Scientific Research, and Duke University (page images at HathiTrust)
 Uniqueness theorems for equations of mixed type III (Washington D. C. : Mathematics Division, Office of Scientific Research, U.S. Air Force, 1959., 1959), by Murray H. Protter, United States. Air Force. Office of Scientific Research, and Berkeley. Department of Mathematics University of California (page images at HathiTrust)
 Unique continuation for elliptic equations (Washington D. C. : Mathematics Division, Office of Scientific Research, U.S. Air Force, 1959., 1959), by Murray H. Protter, United States. Air Force. Office of Scientific Research, and Berkeley. Department of Mathematics University of California (page images at HathiTrust)
 Nonuniqueness in Cauchy's problem (Washington D. C. : Mathematics Division, Office of Scientific Research, U.S. Air Force, 1959., 1959), by A. Plis, United States. Air Force. Office of Scientific Research, and University of Chicago. Department of Mathematics (page images at HathiTrust)
 Lower bounds for the first eigenvalue of elliptic equations and related topics (Washington, D.C. : United States Air Force, Office of Scientific Research, 1958., 1958), by Murray H. Protter, United States. Air Force. Office of Scientific Research, and Berkeley. Department of Mathematics University of California (page images at HathiTrust)
 On a Problem of type, with application to elliptic partial differential equations (College Park, Maryland : University of Maryland, Institute for Fluid Dynamics and Applied Mathematics, 1954., 1954), by Robert Finn, United States. Air Force. Office of Scientific Research, and College Park. Institute for Fluid Dynamics and Applied Mathematics University of Maryland (page images at HathiTrust)
 Axially symmetric solutions of elliptic differential equations (Washington, D.C. : United States Air Force, Office of Scientific Research, 1958., 1958), by Richard C. MacCamy, Carnegie Institute of Technology, and United States. Air Force. Office of Scientific Research (page images at HathiTrust)
 On the Growth of solutions of nonlinear elliptic partial differential equations (College Park, Maryland : University of Maryland, Institute for Fluid Dynamics and Applied Mathematics, 1954., 1954), by Robert Finn, United States. Air Force. Office of Scientific Research, and College Park. Institute for Fluid Dynamics and Applied Mathematics University of Maryland (page images at HathiTrust)
 Reflection principles for linear elliptic second order partial differential equations with constant coefficients (College Park, Maryland : University of Maryland, Institute for Fluid Dynamics and Applied Mathematics, 1954., 1954), by J. B. Diaz, G. S. S. Ludford, United States. Air Force. Office of Scientific Research, and College Park. Institute for Fluid Dynamics and Applied Mathematics University of Maryland (page images at HathiTrust)
 Some results on generalized axially symmetric potentials (College Park, Maryland : University of Maryland, Institute for Fluid Dynamics and Applied Mathematics, 1955., 1955), by Alfred Huber, United States. Air Force. Office of Scientific Research, and College Park. Institute for Fluid Dynamics and Applied Mathematics University of Maryland (page images at HathiTrust)
 New bounds for solutions of second order elliptic partial differential equations ([Washington, D.C.] : [United States Air Force, Office of Scientific Research], [1957], 1957), by Lawrence E. Payne, Hans F. Weinberger, College Park. Institute for Fluid Dynamics and Applied Mathematics University of Maryland, and United States. Air Force. Office of Scientific Research (page images at HathiTrust)
 Ordering and uniqueness of solutions of boundary problems for elliptic equations ([Washington, D.C.] : [United States Air Force, Office of Scientific Research], [1957], 1957), by Carlo Pucci, United States. Air Force. Office of Scientific Research, and College Park. Institute for Fluid Dynamics and Applied Mathematics University of Maryland (page images at HathiTrust)
 Pointwise bounds in parabolic and elliptic partial differential equations ([Washington, D.C.] : [Air Force Office of Scientific Research, United States Air Force], 1961., 1961), by Fred J. Bellar, College Park. Institute for Fluid Dynamics and Applied Mathematics University of Maryland, and United States. Air Force. Office of Scientific Research (page images at HathiTrust)
 Some integral inequalities for uniformly elliptic operators ([Washington, D.C.] : Air Force Office of Scientific Research, Air Research and Development Command, United States Air Force, 1961., 1961), by J. H. Bramble, L. E. Payne, College Park. Institute for Fluid Dynamics and Applied Mathematics University of Maryland, and United States. Air Force. Office of Scientific Research (page images at HathiTrust)
 On Almost periodic solutions of a class of elliptic equations ([Washington, D.C.] : Air Force Office of Scientific Research, United States Air Force, 1962., 1962), by Alexander Weinstein, College Park. Institute for Fluid Dynamics and Applied Mathematics University of Maryland, and United States. Air Force. Office of Scientific Research (page images at HathiTrust)
 Bounds for solutions of second order elliptic partial differential equations (Air Force Office of Scientific Research, Air Research and Development Command, United States Air Force, 1961), by J. H. Bramble, L. E. Payne, College Park. Institute for Fluid Dynamics and Applied Mathematics University of Maryland, and United States. Air Force. Office of Scientific Research (page images at HathiTrust)
 A Theorem on error estimation for finite difference analogues of the dirichlet problem for elliptic equations ([Washington, D.C.] : Air Force Office of Scientific Research, United States Air Force, 1962., 1962), by J. H. Bramble, B. E. Hubbard, College Park. Institute for Fluid Dynamics and Applied Mathematics University of Maryland, and United States. Air Force. Office of Scientific Research (page images at HathiTrust)
 Fundamental solutions for a class of singular equations ([Washington, D.C.] : Air Force Office of Scientific Research, United States Air Force, 1962., 1962), by Richard Jay Weinacht, College Park. Institute for Fluid Dynamics and Applied Mathematics University of Maryland, and United States. Air Force. Office of Scientific Research (page images at HathiTrust)
 Lower bounds for the first eigenvalue of elliptic equations of orders two and four (Washington D. C. : Mathematics Division, Office of Scientific Research, U.S. Air Force, 1960., 1960), by William Weston Hooker, United States. Air Force. Office of Scientific Research, and Berkeley. Department of Mathematics University of California (page images at HathiTrust)
 The iterative solution of elliptic difference equations (New York, New York : AEC Computing Facility, Institute of Mathematical Sciences, New York University, 1957., 1957), by Bernard Friedman, New York University. Institute of Mathematical Sciences, and U.S. Atomic Energy Commission. New York Operations Office (page images at HathiTrust)
 Ordering properties of linear successive iteration schemes (New York, New York: AEC Computing and Applied Mathematics Center, Institute of Mathematical Sciences, New York University, 1958., 1958), by Jack Heller, New York University. Institute of Mathematical Sciences, and U.S. Atomic Energy Commission. New York Operations Office (page images at HathiTrust)
Filed under: Differential equations, Elliptic  Computer programs
Filed under: Differential equations, Elliptic  Data processing
Filed under: Differential equations, Elliptic  Numerical solutions Numerical methods for solving linear systems and applications to elliptic difference equations (Los Alamos Scientific Laboratory of the University of California, 1959), by Clarence E. Lee, P. M. Stone, Los Alamos Scientific Laboratory, and U.S. Atomic Energy Commission (page images at HathiTrust)
 The divergence of Stone's factorizations when no parameters are used (Dept. of Computer Science, University of Illinois at UrbanaChampaign, 1971), by Martin Diamond and University of Illinois at UrbanaChampaign. Dept. of Computer Science (page images at HathiTrust)
 An economical algorithm for the solution of elliptic difference equations independent of usersupplied parameters (Dept. of Computer Science, University of Illinois at UrbanaChampaign, 1971), by Martin A. Diamond (page images at HathiTrust)
 Rapid solution of finite element equations on locally refined grids by multilevel methods (Dept. of Computer Science, University of Illinois at UrbanaChampaign, 1980), by John R. Van Rosendale (page images at HathiTrust)
Filed under: Poisson's equation Measurement of Poisson's ratio of beryllium with electric strain gages (Oak Ridge National Laboratory, 1950), by H. C. Savage, Oak Ridge National Laboratory, and U.S. Atomic Energy Commission (page images at HathiTrust)
 On the LaplacePoisson mixed equation (1918), by Raymond Franklin Borden (page images at HathiTrust; US access only)
 An efficient, accurate numerical method for the solution of a Poisson equation on a sphere (Hanscom AFB, Massachusetts : Air Force Geophysics Laboratories, Air Force Systems Command, United States Air Force, 1977., 1977), by Samuel Y. K. Yee and U.S. Air Force Geophysics Laboratory (page images at HathiTrust)
 Double Fourier series solution of Poisson's equation on a sphere (Hanscom AFB, Massachusetts : Air Force Geophysics Laboratory, Air Force Systems Command, United States Air Force, 1980., 1980), by Samuel Y. K. Yee and U.S. Air Force Geophysics Laboratory (page images at HathiTrust)
 Poisson equation solving program (Stanford, California : Stanford Linear Accelerator Center, Stanford University, 1965., 1965), by William B. Herrmannsfeldt, Stanford University, U.S. Atomic Energy Commission, and Stanford Linear Accelerator Center (page images at HathiTrust)
 On a Class of partial differential equations of even order (College Park, Maryland : University of Maryland, Institute for Fluid Dynamics and Applied Mathematics, 1955., 1955), by A. Weinstein, United States. Air Force. Office of Scientific Research, and College Park. Institute for Fluid Dynamics and Applied Mathematics University of Maryland (page images at HathiTrust)
 Subharmonic functions and generalized tricomi equations (College Park, Maryland : University of Maryland, Institute for Fluid Dynamics and Applied Mathematics, 1956., 1956), by Alexander Weinstein, United States. Air Force. Office of Scientific Research, and College Park. Institute for Fluid Dynamics and Applied Mathematics University of Maryland (page images at HathiTrust)
 On the EulerPoissonDarboux equation, integral operators, and the method of descent (College Park, Maryland : University of Maryland, Institute for Fluid Dynamics and Applied Mathematics, 1955., 1955), by J. B. Diaz, United States. Air Force. Office of Scientific Research, and College Park. Institute for Fluid Dynamics and Applied Mathematics University of Maryland (page images at HathiTrust)
 On the iterated wave equation (College Park, Maryland : University of Maryland, Institute for Fluid Dynamics and Applied Mathematics, 1956., 1956), by Dorothee Krahn, College Park. Institute for Fluid Dynamics and Applied Mathematics University of Maryland, and United States. Air Force. Office of Scientific Research (page images at HathiTrust)
 On the Formulation of finite difference analogues of the Dirichlet problem for Poisson's equation ([Washington, D.C.] : Air Force Office of Scientific Research, United States Air Force, 1961., 1961), by J. H. Bramble, B. E. Hubbard, College Park. Institute for Fluid Dynamics and Applied Mathematics University of Maryland, and United States. Air Force. Office of Scientific Research (page images at HathiTrust)
 Fourth order finite difference analogues of the dirichlet problem for poisson's equation in three and four dimensions ([Washington, D.C.] : Air Force Office of Scientific Research, United States Air Force, 1962., 1962), by J. H. Bramble, College Park. Institute for Fluid Dynamics and Applied Mathematics University of Maryland, and United States. Air Force. Office of Scientific Research (page images at HathiTrust)
 Poisson's equation and generalized axially symmetric potential theory ([Washington, D.C.] : Air Force Office of Scientific Research, United States Air Force, 1962., 1962), by Robert P. Gilbert, College Park. Institute for Fluid Dynamics and Applied Mathematics University of Maryland, and United States. Air Force. Office of Scientific Research (page images at HathiTrust)
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