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Related to Fourier analysis: Fourier series
The branch of mathematics concerned with the approximation of periodic functions by the Fourier series and with generalizations of such approximations to a wider class of functions.
(Mathematics) the analysis of a periodic function into its simple sinusoidal or harmonic components, whose sum forms a Fourier series
[C19: named after Baron Jean Baptiste Joseph Fourier (1768–1830), French mathematician, Egyptologist, and administrator]
the expression of any periodic function as a sum of sine and cosine functions, as in an electromagnetic wave function.
[1925–30; after J.B.J. Fourier]