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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 : where 1''E'' denotes the indicator function of a subset ''E'' ⊆ R''n'' and ''L''(''f'', ''t'') denotes the super-level set : The layer cake representation follows easily from observing that : and then using the formula : 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)』 ■ウィキペディアで「layer cake representation」の詳細全文を読む スポンサード リンク
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