For a bounded f where all functions are bounded continuous functions, when X ( t ) is a solution to the above equation, f ( X ( t ), t ) satisfies the following stochastic differential equation. This can be obtained by formally expanding f into a Taylor expansion, dBi ( t ) dBj ( t )= dt (when i = j ), dBi ( t ) dBj ( t ) = 0 (when i ≠ j ), and is called the Ito formula, which is a fundamental formula. [Makiko Nishio]. … *Some of the terminology that refers to the "Ito Formula" is listed below. Source | Heibonsha World Encyclopedia 2nd Edition | Information |
…がすべて有界連続関数となる有界なfに対し,X(t)が上記方程式の解であるとき,f(X(t),t)は次の確率微分方程式を満たす。これはfを形式的にテーラー展開して,dBi(t)dBj(t)=dt(i=jのとき),dBi(t)dBj(t)=0(i≠jのとき)として得られるが,伊藤公式と呼ばれ基本公式になっている。【西尾 真喜子】。… ※「伊藤公式」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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