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翻訳と辞書　辞書検索 [ 開発暫定版 ] スポンサード リンク Heaviside cover-up method ： ウィキペディア英語版 Heaviside cover-up method The Heaviside cover-up method, named after Oliver Heaviside, is one possible approach in determining the coefficients when performing the partial-fraction expansion of a rational function.〔Calculus and Analytic Geometry 7th Edition, Thomas/Finney, 1988, pp. 482-489〕 == Method == Separation of a fractional algebraic expression into partial fractions is the reverse of the process of combining fractions by converting each fraction to the lowest common denominator (LCM) and adding the numerators. This separation can be accomplished by the Heaviside cover-up method, another method for determining the coefficients of a partial fraction. Case one has fractional expressions where factors in the denominator are unique. Case two has fractional expressions where some factors may repeat as powers of a binomial. In integral calculus we would want to write a fractional algebraic expression as the sum of its partial fractions in order to take the integral of each simple fraction separately. Once the original denominator, D0, has been factored we set up a fraction for each factor in the denominator. We may use a subscripted D to represent the denominator of the respective partial fractions which are the factors in D0. Letters A, B, C, D, E, and so on will represent the numerators of the respective partial fractions. When a partial fraction term has a single (i.e. unrepeated) binomial in the denominator, the numerator is called a residue. We calculate each respective numerator by (1) taking the root of the denominator (i.e. the value of ''x'' that makes the denominator zero) and (2) then substituting this root into the original expression but ignoring the corresponding factor in the denominator. Each root for the variable is the value which would give an undefined value to the expression since we do not divide by zero. General formula for a cubic denominator with three distinct roots: : $\backslash frac\; =\; \backslash frac\; +\; \backslash frac\; +\; \backslash frac$ Where ''x'' = ''a'' and : $A\; =\backslash frac;$ and where ''x'' = ''b'' and : $B\; =\; \backslash frac;$ and where ''x'' = ''c'' and : $C\; =\; \backslash frac.$ 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「Heaviside cover-up method」の詳細全文を読む スポンサード リンク 翻訳と辞書 : 翻訳のためのインターネットリソース Copyright(C) kotoba.ne.jp 1997-2016. All Rights Reserved.