Trapezoidal rule - trapezoidal formula

Japanese: 台形公式 - だいけいこうしき(英語表記)trapezoidal formula
Trapezoidal rule - trapezoidal formula
Also known as the trapezoidal rule. One of the formulas for approximating a definite integral. When calculating an approximation of a definite integral, divide the interval [ a , b ] into n small intervals using n + 1 subintervals x0 , x1 , x2 , ..., xn (where a = x0 < x1 < x2 < ... < xn -1 < xn = b ), calculate the value f ( xi ) of f ( x ) for each subinterval xi ( i = 0, 1, 2, ..., n ), and substitute the value into the following formula.
The above formula is called the trapezoidal rule because it approximates a definite integral as a sum of trapezoids. It corresponds to the Newton–Cotes formula when n = 1.

Source: Encyclopaedia Britannica Concise Encyclopedia About Encyclopaedia Britannica Concise Encyclopedia Information

Japanese:
台形則ともいう。定積分の近似値を求める公式の一つ。定積分の近似値を計算するとき,区間 [ab] を n+1 個の分点 x0x1x2 ,…,xn (ただし ax0x1x2<…<xn-1xnb ) で n 個の小区間に等分し,各分点 xi ( i=0 ,1,2,…,n ) に対する f(x) の値 f(xi) を計算し,次の公式に代入する。
上の公式は定積分の近似値を台形の和として求めるので,台形公式という。これはニュートン=コーツの公式の n=1 の場合にあたる。

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