Stieltjes integral

Japanese: スティルチェス積分 - スティルチェスせきぶん(英語表記)Stieltjes integral
Stieltjes integral
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 ix 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

Japanese:
f(x) および g(x) を閉区間 [ab] で定義された有界な関数とし,[ab] の分割 Δ を,ax0x1x2x3<…<xnb とする。この分割 Δ に対し,[xixi-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 (xixi-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。

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