Potential theory Basic notions Concept
Harmonic function
Builds on Laplacian
Summary
A harmonic function is a twice continuously differentiable function on an open subset of whose Laplacian is zero at each point. Harmonic functions describe steady states, such as equilibrium temperatures and electrostatic potentials in empty space.
Reading path
To understand this page from the ground up, read these 12 pages in order. The foundations come first.
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- no evidence level
- Euclidean space object
- Function concept
- Total derivative concept
- Function of several variables concept
- Vector-valued function concept
- Differentiable function of several variables concept
- Partial derivative concept
- Vector field concept
- Gradient concept
- Divergence concept
- Laplacian concept
- Harmonic function concept
Where this leads
102 pages build on this one.
- Conformal invariance of harmonic functions
- Green's function for the Laplacian
- Phragmén–Lindelöf principle for subharmonic functions
- Harmonic functions on Riemannian manifolds
- Pluriharmonic function
- Cheng–Yau gradient estimate
- Removable singularities for harmonic functions
- Minimum principle for harmonic functions
- Superharmonic function
- Zaremba's punctured ball
- Harmonic at a point
- Newtonian potential
- Krylov–Safonov estimate
- Neumann problem
- Schwarz integral formula
- Harmonic majorant
- Harnack inequality for parabolic equations
- Log-modulus of a holomorphic function is subharmonic
- Single layer potential
- Mutual absolute continuity of harmonic measures
- Lusin area integral
- Dirichlet problem
- Positive harmonic function
- Weyl's lemma
- Brelot space
- Maximum principle for subharmonic functions
- Fundamental solution of the Laplacian
- Herglotz representation theorem
- Poisson–Jensen formula
- Subharmonic function
- Poisson's equation
- Newtonian kernel
- Smoothness and analyticity of harmonic functions
- Sub-mean value property
- Riesz decomposition theorem
- Kakutani's solution of the Dirichlet problem
- Boundary integral equation for the Neumann problem
- Converse of the mean value property
- Local existence of harmonic conjugates
- Boundary integral method for the Dirichlet problem
- Earnshaw's theorem
- Logarithmic kernel
- Spherical harmonics
- Dirichlet-to-Neumann operator
- Plateau's problem
- Convex functions of subharmonic functions
- Harmonic measure
- Superharmonic potential
- Resolutivity of boundary functions
- Minimal harmonic function
- Riesz measure of a subharmonic function
- Martin kernel
- Calderón projector
- Obstacle problem
- Double layer potential
- Jump relations for layer potentials
- Discrete harmonic function
- Stefan problem as a variational inequality
- Douglas–Radó solution of Plateau's problem
- Koebe's theorem on the mean value property
- Perron method
- Compactness of families of harmonic functions
- Gradient estimates for harmonic functions
- p-harmonic function
- Kelvin transform
- Harnack's principle
- Poisson integral formula
- Littlewood subordination theorem
- Biharmonic equation
- Dahlberg's theorem on harmonic measure
- Boundary Harnack principle
- Least harmonic majorant
- Liouville's theorem for harmonic functions
- Removable sets for bounded harmonic functions
- Calderón problem
- Dirichlet's principle
- Harmonic functions on Riemann surfaces
- Hardy spaces of harmonic functions
- Herglotz–Riesz kernel
- Martin boundary
- Liouville's theorem for planar harmonic functions
- Green's function of the ball
- Maximum principle for harmonic functions
- Hadamard three-circle theorem for subharmonic functions
- Lindelöf's maximum principle
- Condenser capacity
- Poisson kernel
- Harmonic measure as exit distribution
- Bateman transform
- Parabolic and hyperbolic Riemann surfaces
- Poisson integral for the half-space
- Logarithmic potential
- Harmonic space
- Hadamard's two-constants theorem
- Schwarz reflection principle for harmonic functions
- Method of fundamental solutions
- Bôcher's theorem
- Harnack's inequality
- Free boundary problem
- Expansion in spherical harmonics
- Hartogs lemma for subharmonic functions
- Boundary integral equation for the Dirichlet problem
Further reading
- Web https://en.wikipedia.org/wiki/Harmonic_function, lead section
About this page
| Tag | 0DEB0JMN0W |
|---|---|
| URI | m2://0DEB0JMN0W |
| Aliases | solution-of-laplace-equation |
| Kind | concept |
| Writing | W1 stated |
| MSC | 31B05 |
| Uses | Laplacian |
| Same as |
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What this page needs for W2
- edge instance_of in: at least two examples (0 of 2)
- edge not_instance_of in: at least one non-example (0 of 1)
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Definitions
Results about this
- Conformal invariance of harmonic functions
- Removable singularities for harmonic functions
- Minimum principle for harmonic functions
- Neumann problem
- Dirichlet problem
- Weyl's lemma
- Herglotz representation theorem
- Smoothness and analyticity of harmonic functions
- Converse of the mean value property
- Local existence of harmonic conjugates
- Earnshaw's theorem
- Koebe's theorem on the mean value property
- Compactness of families of harmonic functions
- Gradient estimates for harmonic functions
- Harnack's principle
- Boundary Harnack principle
- Liouville's theorem for harmonic functions
- Removable sets for bounded harmonic functions
- Liouville's theorem for planar harmonic functions
- Maximum principle for harmonic functions
- Schwarz reflection principle for harmonic functions
- Bôcher's theorem
- Harnack's inequality
- Expansion in spherical harmonics
Used by
- Conformal invariance of harmonic functions
- Green's function for the Laplacian
- Phragmén–Lindelöf principle for subharmonic functions
- Harmonic functions on Riemannian manifolds
- Pluriharmonic function
- Removable singularities for harmonic functions
- Minimum principle for harmonic functions
- Superharmonic function
- Harmonic at a point
- Newtonian potential
- Neumann problem
- Schwarz integral formula
- Harmonic majorant
- Log-modulus of a holomorphic function is subharmonic
- Single layer potential
- Lusin area integral
- Dirichlet problem
- Positive harmonic function
- Weyl's lemma
- Fundamental solution of the Laplacian
- Herglotz representation theorem
- Poisson–Jensen formula
- Subharmonic function
- Poisson's equation
- Newtonian kernel
- Smoothness and analyticity of harmonic functions
- Riesz decomposition theorem
- Kakutani's solution of the Dirichlet problem
- Boundary integral equation for the Neumann problem
- Converse of the mean value property
- Local existence of harmonic conjugates
- Earnshaw's theorem
- Logarithmic kernel
- Spherical harmonics
- Plateau's problem
- Convex functions of subharmonic functions
- Superharmonic potential
- Resolutivity of boundary functions
- Minimal harmonic function
- Riesz measure of a subharmonic function
- Martin kernel
- Calderón projector
- Obstacle problem
- Double layer potential
- Discrete harmonic function
- Douglas–Radó solution of Plateau's problem
- Koebe's theorem on the mean value property
- Compactness of families of harmonic functions
- Gradient estimates for harmonic functions
- p-harmonic function
- Kelvin transform
- Poisson integral formula
- Biharmonic equation
- Boundary Harnack principle
- Least harmonic majorant
- Liouville's theorem for harmonic functions
- Removable sets for bounded harmonic functions
- Dirichlet's principle
- Harmonic functions on Riemann surfaces
- Hardy spaces of harmonic functions
- Martin boundary
- Liouville's theorem for planar harmonic functions
- Green's function of the ball
- Maximum principle for harmonic functions
- Condenser capacity
- Poisson kernel
- Bateman transform
- Poisson integral for the half-space
- Logarithmic potential
- Harmonic space
- Schwarz reflection principle for harmonic functions
- Bôcher's theorem
- Harnack's inequality
- Free boundary problem
- Expansion in spherical harmonics
- Boundary integral equation for the Dirichlet problem