Let f ( x ) and g ( x ) be bounded functions defined in the closed interval [ a , b ], and let the partition Δ of [ a , b ] be a = x0 < x1 < x2 < x3 < ... < xn = b . For this partition Δ , choose an arbitrary point t i included in [ x i , x i -1 ] and calculate the sum If S Δ converges to a certain limit value when the maximum width of the division Δ , that is, δ =max( x i - x i -1 ) approaches 0 infinitesimally, regardless of the division method and the corresponding t i , then the limit value is called and is called the Stieltjes integral of f ( x ) using the function g ( x ). Source: Encyclopaedia Britannica Concise Encyclopedia About Encyclopaedia Britannica Concise Encyclopedia Information |
f(x) および g(x) を閉区間 [a,b] で定義された有界な関数とし,[a,b] の分割 Δ を,a=x0<x1<x2<x3<…<xn=b とする。この分割 Δ に対し,[xi,xi-1] に含まれる任意の点 ti を選んで,和 をつくる。分割 Δ の幅のうちで最大のもの,すなわち δ= max (xi-xi-1) を限りなく0に近づけるとき,あらゆる分割の仕方,およびそれに応じる ti のとり方にかかわらず SΔ が一定の極限値に収束するならば,その極限値を と書き,関数 g(x) を用いてつくられる f(x) のスティルチェス積分という。 出典 ブリタニカ国際大百科事典 小項目事典ブリタニカ国際大百科事典 小項目事典について 情報 |
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