...When f is unbounded, we define f n ( x ) = min { f ( x ), n }. When the value of this integral is finite, f is said to be integrable on E. For a general real-valued function f , if f + = max { f , 0} and f - = max {- f , 0}, then f + and f - are also measurable, and f = f + - f - ( f + ≧ 0, f - ≧ 0), so we define it as when at least one of f + and f - is integrable. ... *Some of the terminology explanations that mention "integrable" are listed below. Source | Heibonsha World Encyclopedia 2nd Edition | Information |
…fが有界でないときはfn(x)=min{f(x),n}として,と定義する。この積分の値が有限のときfはE上で可積分であるという。一般の実数値関数fに対しては,f+=max{f,0},f-=max{-f,0}とするとf+,f-も可測で, f=f+-f- (f+≧0,f-≧0) となるから,f+,f-の少なくとも一方が可積分のとき,と定義する。… ※「可積分」について言及している用語解説の一部を掲載しています。 出典|株式会社平凡社世界大百科事典 第2版について | 情報 |
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