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Conjugate Fourier series : ウィキペディア英語版
Conjugate Fourier series

In the mathematical field of Fourier analysis, the conjugate Fourier series arises by realizing the Fourier series formally as the boundary values of the real part of a holomorphic function on the unit disc. The imaginary part of that function then defines the conjugate series. studied the delicate questions of convergence of this series, and its relationship with the Hilbert transform.
In detail, consider a trigonometric series of the form
:f(\theta) = \tfrac12 a_0 + \sum_^\infty \left(a_n\cos n\theta + b_n\sin n\theta\right)
in which the coefficients ''a''''n'' and ''b''''n'' are real numbers. This series is the real part of the power series
:F(z) = \tfrac12 a_0 + \sum_^\infty (a_n-ib_n)z^n
along the unit circle with z=e^. The imaginary part of ''F''(''z'') is called the conjugate series of ''f'', and is denoted
:\tilde(\theta) = \sum_^\infty \left(a_n\sin n\theta - b_n\cos n\theta\right).
==See also==

* Harmonic conjugate

抄文引用元・出典: フリー百科事典『 ウィキペディア(Wikipedia)
ウィキペディアで「Conjugate Fourier series」の詳細全文を読む



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