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  2. Harmonic function - Wikipedia

    en.wikipedia.org/wiki/Harmonic_function

    Each function above will yield another harmonic function when multiplied by a constant, rotated, and/or has a constant added. 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". Also, the sum of any two harmonic functions will ...

  3. Bluetooth - Wikipedia

    en.wikipedia.org/wiki/Bluetooth

    The Bluetooth SIG published the Bluetooth Core Specification version 5.3 on 13 July 2021. The feature enhancements of Bluetooth 5.3 are: [128] Connection Subrating; Periodic Advertisement Interval; Channel Classification Enhancement; Encryption key size control enhancements; The following features were removed in this version of the specification:

  4. Kelvin transform - Wikipedia

    en.wikipedia.org/wiki/Kelvin_transform

    The Kelvin transform is a device used in classical potential theory to extend the concept of a harmonic function, by allowing the definition of a function which is 'harmonic at infinity'. This technique is also used in the study of subharmonic and superharmonic functions.

  5. Harmonic analysis - Wikipedia

    en.wikipedia.org/wiki/Harmonic_analysis

    Harmonic analysis is a branch of mathematics concerned with investigating the connections between a function and its representation in frequency.The frequency representation is found by using the Fourier transform for functions on unbounded domains such as the full real line or by Fourier series for functions on bounded domains, especially periodic functions on finite intervals.

  6. Harmonic - Wikipedia

    en.wikipedia.org/wiki/Harmonic

    In physics, acoustics, and telecommunications, a harmonic is a sinusoidal wave with a frequency that is a positive integer multiple of the fundamental frequency of a periodic signal. The fundamental frequency is also called the 1st harmonic ; the other harmonics are known as higher harmonics .

  7. Perron method - Wikipedia

    en.wikipedia.org/wiki/Perron_method

    In the mathematical study of harmonic functions, the Perron method, also known as the method of subharmonic functions, is a technique introduced by Oskar Perron for the solution of the Dirichlet problem for Laplace's equation. The Perron method works by finding the largest subharmonic function with boundary values below the desired values; the ...

  8. Kempner series - Wikipedia

    en.wikipedia.org/wiki/Kempner_series

    The series converges extremely slowly. Baillie [4] remarks that after summing 10 24 terms the remainder is still larger than 1. [9]The upper bound of 80 is very crude. In 1916, Irwin [10] showed that the value of the Kempner series is between 22.4 and 23.3, since refined to the value above, 22.92067...

  9. Three spheres inequality - Wikipedia

    en.wikipedia.org/wiki/Three_spheres_inequality

    Download QR code; Print/export Download as PDF; ... be an harmonic function on ... centred at the origin and where ...