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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Why was FFT needed to detect Soviet nuclear tests?
On the Wikipedia page of Fast Fourier transform it mentions that
[John] Tukey came up with the idea during a meeting of President Kennedy's Science Advisory Committee where a discussion topic ...
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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 / ...
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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 ...
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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 ...
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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)...
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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 ...
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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?
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