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Progressive function : ウィキペディア英語版
Progressive function

In mathematics, a progressive function ''ƒ'' ∈ ''L''2(R) is a function whose Fourier transform is supported by positive frequencies only:
:\mathop\hat \subseteq \mathbb_+.
It is called super regressive if and only if the time reversed function ''f''(−''t'') is progressive, or equivalently, if
:\mathop\hat \subseteq \mathbb_-.
The complex conjugate of a progressive function is regressive, and vice versa.
The space of progressive functions is sometimes denoted H^2_+(R), which is known as the Hardy space of the upper half-plane. This is because a progressive function has the Fourier inversion formula
:f(t) = \int_0^\infty e^ \hat f(s)\, ds
and hence extends to a holomorphic function on the upper half-plane \
by the formula
:f(t+iu) = \int_0^\infty e^ \hat f(s)\, ds
= \int_0^\infty e^ e^ \hat f(s)\, ds.
Conversely, every holomorphic function on the upper half-plane which is uniformly square-integrable on every horizontal line
will arise in this manner.
Regressive functions are similarly associated with the Hardy space on the lower half-plane \.


抄文引用元・出典: フリー百科事典『 ウィキペディア(Wikipedia)
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