Questions tagged [harmonic-analysis]

Harmonic analysis is a branch of mathematics concerned with the representation of functions or signals as the superposition of basic waves, and the study of and generalization of the notions of Fourier series and Fourier transforms.

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Is there any meaningful history behind harmonic mean?

I am trying to understand the origin of harmonic mean and get an intuitively feel for why it was invented in the first place. I have surfed the web but I keep seeing things like harmonic series / ...
Alexander's user avatar
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Who first stated the "uncertainty principle" for Fourier transforms?

My question is clearly related to this one, but my interest is not specifically in Heisenberg's result. To quote from Wikipedia. A nonzero function and its Fourier transform cannot both be sharply ...
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Early results on the Fourier transform

Published tables of Fourier transform pairs have been available for many years. One such example is the paper by George Campbell in the Bell Systems Technical Journal in 1928. Most such tables simply ...
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How and when did the dedicated study of locally compact groups begin?

How and when did the dedicated study of locally compact groups begin? Specific instances from literature, recorded stories, etc., may help supplement the answers. There seems to be no reason why I ...
stoic-santiago's user avatar
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When was the study of automorphic (and in particular modular) forms become "adelized"?

The theory of automorphic forms is stated in modern language as a function on the adelic points of some reductive group satisfying certain properties (see for instance, Chapter 7 of An Introduction to ...
Anton Hilado's user avatar
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Seeking quotes rejecting early forms of the Dirac delta

Question Why is Dirac delta named after Dirac when the concept was already over two centuries old? notes the Dirac delta function effectively appeared centuries before Dirac. This was long before the ...
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Can "Laplace limit" phenomenon be considered the first example of non-convergent Fourier series?

Traditionally, the first example of a non-convergent Fourier series of a function is considered to be the example constructed in 1870 by the mathematician Paul David Gustav du Bois-Reymond. His ...
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What did Fourier mean by stating that every function can be decomposed into sine and cosine functions?

Fourier stated that every function can be decomposed into sine and cosine functions. Was he referring to periodic functions only? To a certain class only? I ask, because it seems clear (at least to me)...
Deschele Schilder's user avatar
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Was Fourier inspired by Ptolemy?

Ptolemy invented a system to describe the periodic motion of the planets by epicycles. Fourier did something similar for periodic motion in mechanics. Every such motion can be thought of as ...
Deschele Schilder's user avatar
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What does the Fourier transform have to do with heat?

For example the current version of the Fourier analysis article on Wikipedia says the study is: […] named after Joseph Fourier, who showed that representing a function as a sum of trigonometric ...
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How did Fourier determine the coefficients of Fourier series?

I was reading a chapter of Fourier's seminal work "Analytic Theory of Heat". The third chapter of this book was translated by the famous Stephen Hawking in his book "God created the ...
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Has anyone explored Ptolemy's epicycles as an early form of Fourier analysis?

Whilst researching science in the ancient world, I came across an observation, which unfortunately I did not make a note of, and so cannot credit, that Ptolemy's epicycles were an early form of ...
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How was Fourier analysis important to the development of set theory?

I recently read the following quote (unfortunately, I copied it down without attribution): You may be surprised to know that Fourier analysis played a role in the early development of set theory. In ...
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Origin of the Fourier transform (1878)

I located Joseph Fourier's book, Analytical Theory of Heat (1878), but at first glance it looks like it is all about heat. What did Fourier call the Fourier transform? When did he first use it?
Christina Daniel's user avatar
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Substantiating claimed Fourier quote about “an arbitrarily capricious graph”

The following quote (in English) is fairly widely attributed to Fourier, but I can't substantiate it. An arbitrary function, continuous or with discontinuities, defined in a finite interval by an ...
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On the origin of the concept of aliasing & the Discrete Fourier Transform frequency axis

The development of the fast Fourier transform (FFT) is attributed to Cooley & Tukey, both of whom have written a lot about its historical development. However, I am searching for early ...
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Who came up with the convolution theorem?

I am looking for the earliest reference which proposed the convolution theorem which is often utilized in signal processing (i.e., convolution becomes multiplication in the Fourier domain). The ...
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What are some good references elucidating the discovery/creation of Fourier Series?

I've always grappled with anything related to Fourier since my undergrad days. Recently, when revisiting why I learned what I did, I discovered how Fourier's desire to understand the flow of heat ...
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Dirichlet's Proof of the Convergence of Fourier Series

Where can I find Dirichlet's proof of the convergence of Fourier series?
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Who first noted the connection between Heisenberg's uncertainty principle and the Fourier transform?

Who first noted the connection between Heisenberg's uncertainty principle and the Fourier transform?
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First evaluation of $\sum_{n \geq 1} 1/n^2$ by Fourier series

There are many ways to evaluate $\sum_{n \geq 1} 1/n^2$ as $\pi^2/6$, including multiple solutions using Fourier series. A colleague asked me who was the first person to use Fourier series (or Fourier ...
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