Examples of using Harmonic function in English and their translations into Greek
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Harmonic function.
Properties of harmonic functions.
Harmonic functions are infinitely differentiable.
Its solutions are called harmonic functions.
All harmonic functions are analytic, that is, they can be locally expressed as power series.
Laplace's equation, which defines harmonic functions.
Also, the sum of any two harmonic functions will yield another harmonic function.
Laplace's equation, which defines harmonic functions.
Some important properties of harmonic functions can be deduced from Laplace's equation.
Solutions of this equation are called harmonic functions.
For example, we may seek a harmonic function that takes on the values u(θ) on a circle of radius one.
Solutions to Laplace's equation are called harmonic functions.
If f is a harmonic function defined on all of Rn which is bounded above or bounded below, then f is constant.
Local estimates for harmonic functions.
That the latter is a Hilbert space at all is a consequence of the mean value theorem for harmonic functions.
Then f extends to a harmonic function on Ω(compare Riemann's theorem for functions of a complex variable).
The following principle of removal of singularities holds for harmonic functions.
A weakly harmonic function coincides almost everywhere with a strongly harmonic function, and is in particular smooth.
This condition guarantees that themaximum principle will hold, although other properties of harmonic functions may fail.
Conversely, given a harmonic function, it is the real part of an analytic function, f(z)(at least locally).
A weakly harmonic distribution is precisely the distribution associated to a strongly harmonic function, and so also is smooth.
Conversely, any harmonic function u on an open subset Ω of R2 is locally the real part of a holomorphic function. .
In other words, if we express a holomorphic function f(z) as u(x, y)+ i v(x, y) both u andv are harmonic functions, where v is the harmonic conjugate of u.
Conversely, given any harmonic function in two dimensions, it is the real part of an analytic function, at least locally.
More generally, a function is subharmonic if and only if, in the interior of anyball in its domain, its graph lies below that of the harmonic function interpolating its boundary values on the ball.
The descriptor"harmonic" in the name harmonic function originates from a point on a taut string which is undergoing harmonic motion.
Harmonic functions that arise in physics are determined by their singularities and boundary conditions(such as Dirichlet boundary conditions or Neumann boundary conditions).
The inversion of each function will yield another harmonic function which has singularities which are the images of the original singularities in a spherical"mirror".
The singular points of the harmonic functions above are expressed as"charges" and"charge densities" using the terminology of electrostatics, andso the corresponding harmonic function will be proportional to the electrostatic potential due to these charge distributions.
If B(x, r) is a ball with center x and radius r which is completely contained in theopen set Ω⊂ Rn, then the value u(x) of a harmonic function u: Ω→ R at the center of the ball is given by the average value of u on the surface of the ball; this average value is also equal to the average value of u in the interior of the ball.