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layer cake representation : ウィキペディア英語版
layer cake representation
In mathematics, the layer cake representation of a non-negative, real-valued measurable function ''f'' defined on ''n''-dimensional Euclidean space R''n'' is the formula
:f(x) = \int_0^ 1_ (x) \, \mathrm t \text x \in \mathbb^,
where 1''E'' denotes the indicator function of a subset ''E'' ⊆ R''n'' and ''L''(''f'', ''t'') denotes the super-level set
:L(f, t) = \.
The layer cake representation follows easily from observing that
: 1_(x) = 1_(t)
and then using the formula
:f(x) = \int_0^ \mathrm t.
The layer cake representation takes its name from the representation of the value ''f''(''x'') as the sum of contributions from the "layers" ''L''(''f'', ''t''): "layers"/values ''t'' below ''f''(''x'') contribute to the integral, while values ''t'' above ''f''(''x'') do not.
== See also ==

*Symmetric decreasing rearrangement

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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