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A Fourier series (/ ˈ f ʊr i eɪ,-i ər / [1]) is an expansion of a periodic function into a sum of trigonometric functions. The Fourier series is an example of a trigonometric series. [2] By expressing a function as a sum of sines and cosines, many problems involving the function become easier to analyze because trigonometric functions are ...
An Elementary Treatise on Fourier's Series: And Spherical, Cylindrical, and Ellipsoidal Harmonics, with Applications to Problems in Mathematical Physics (2 ed.). Ginn. p. 30. Carslaw, Horatio Scott (1921). "Chapter 7: Fourier's Series". Introduction to the Theory of Fourier's Series and Integrals, Volume 1 (2 ed.). Macmillan and Company. p. 196.
A number of authors, notably Jean le Rond d'Alembert, and Carl Friedrich Gauss used trigonometric series to study the heat equation, [20] but the breakthrough development was the 1807 paper Mémoire sur la propagation de la chaleur dans les corps solides by Joseph Fourier, whose crucial insight was to model all functions by trigonometric series ...
In mathematical analysis, Parseval's identity, named after Marc-Antoine Parseval, is a fundamental result on the summability of the Fourier series of a function. The identity asserts the equality of the energy of a periodic signal (given as the integral of the squared amplitude of the signal) and the energy of its frequency domain representation (given as the sum of squares of the amplitudes).
The rest of the text covers topics such as continuous functions, differentiation, the Riemann–Stieltjes integral, sequences and series of functions (in particular uniform convergence), and outlines examples such as power series, the exponential and logarithmic functions, the fundamental theorem of algebra, and Fourier series.
The books "received rave reviews indicating they are all outstanding works written with remarkable clarity and care." [ 1 ] Reviews praised the exposition, [ 2 ] [ 4 ] [ 11 ] identified the books as accessible and informative for advanced undergraduates or graduate math students, [ 2 ] [ 4 ] [ 9 ] [ 10 ] and predicted they would grow in ...
The uniqueness and the zeros of trigonometric series was an active area of research in 19th century Europe. First, Georg Cantor proved that if a trigonometric series is convergent to a function on the interval [,], which is identically zero, or more generally, is nonzero on at most finitely many points, then the coefficients of the series are all zero.
Generalized Fourier Series at MathWorld; Herman, Russell (2016). An Introductions to Fourier and Complex Analysis with Applications to the Spectral Analysis of Signals (PDF). pp. 73– 112. Folland, Gerald B. (1992). Fourier Analysis and Its Applications (PDF). Pacific Grove, California: Wadsworth & Brooks/Cole Advanced Books & Software. pp. 62 ...
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