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  2. Hankel transform - Wikipedia

    en.wikipedia.org/wiki/Hankel_transform

    The Hankel transform appears when one writes the multidimensional Fourier transform in hyperspherical coordinates, which is the reason why the Hankel transform often appears in physical problems with cylindrical or spherical symmetry. Consider a function () of a -dimensional vector r.

  3. Hankel matrix - Wikipedia

    en.wikipedia.org/wiki/Hankel_matrix

    The Hankel matrix transform, or simply Hankel transform, of a sequence is the sequence of the determinants of the Hankel matrices formed from .Given an integer >, define the corresponding ()-dimensional Hankel matrix as having the matrix elements [], = +.

  4. List of transforms - Wikipedia

    en.wikipedia.org/wiki/List_of_transforms

    Hankel transform, the determinant of the Hankel matrix; Discrete Chebyshev transform. Equivalent, up to a diagonal scaling, to a discrete cosine transform;

  5. Y and H transforms - Wikipedia

    en.wikipedia.org/wiki/Y_and_H_transforms

    These transforms are closely related to the Hankel transform, as both involve Bessel functions. In problems of mathematical physics and applied mathematics, the Hankel, Y, H transforms all may appear in problems having axial symmetry. Hankel transforms are however much more commonly seen due to their connection with the 2-dimensional Fourier ...

  6. Bessel function - Wikipedia

    en.wikipedia.org/wiki/Bessel_function

    Bessel functions describe the radial part of vibrations of a circular membrane.. Bessel functions, named after Friedrich Bessel who was the first to systematically study them in 1824, [1] are canonical solutions y(x) of Bessel's differential equation + + = for an arbitrary complex number, which represents the order of the Bessel function.

  7. Hermann Hankel - Wikipedia

    en.wikipedia.org/wiki/Hermann_Hankel

    Hermann Hankel (14 February 1839 – 29 August 1873) was a German mathematician. Having worked on mathematical analysis during his career, he is best known for introducing the Hankel transform and the Hankel matrix .

  8. Near and far field - Wikipedia

    en.wikipedia.org/wiki/Near_and_far_field

    Typically one finds simple relations describing the antenna far-field patterns, often involving trigonometric functions or at worst Fourier or Hankel transform relationships between the antenna current distributions and the observed far-field patterns. While far-field simplifications are very useful in engineering calculations, this does not ...

  9. Green's function - Wikipedia

    en.wikipedia.org/wiki/Green's_function

    where () is the Hankel function of the second kind, and () is the spherical Hankel function of the second kind stationary 3D Schrödinger equation for free particle Divergence operator ∇ ⋅ v {\displaystyle \nabla \cdot \mathbf {v} }