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词汇 Abel transform
分类 英语词汇 英语翻译词典
释义

Abel transform

中文百科

分部求和法

分部求和法（英语：Summation by parts）也叫阿贝尔变换（英语：Abel transformation，有别于Abel transform）或阿贝尔引理（英语：Abel's lemma）是求和的一种方法。设\{f_k\}和\{g_k\}为两个数列，则有

\sum_{k=m}^n f_k(g_{k+1g_k) = \left[f_{n}g_{n+1} - f_m g_m\right] - \sum_{k=m}^n g_{k+1}(f_{k+1 f_k).

它被用来证明积分第二中值定理。

分部求和公式也可被写成比较对称的方式：

\sum _{i=m+1}^n \left(b_i-b_{i-1}\right) a_i+\sum _{i=m+1}^n \left(a_i-a_{i-1}\right) b_{i-1} =a_n b_n-a_m b_m =\sum _{i=m+1}^n \left(b_i-b_{i-1}\right) a_{i-1}+\sum _{i=m+1}^n \left(a_i-a_{i-1}\right) b_i
英语百科

Abel transform 分部求和公式

A geometrical interpretation of the Abel transform in two dimensions. An observer (I) looks along a line parallel to the x-axis a distance y above the origin. What the observer sees is the projection (i.e. the integral) of the circularly symmetric function f(r) along the line of sight. The function f(r) is represented in gray in this figure. The observer is assumed to be located infinitely far from the origin so that the limits of integration are ±∞

In mathematics, the Abel transform, named for Niels Henrik Abel, is an integral transform often used in the analysis of spherically symmetric or axially symmetric functions. The Abel transform of a function f(r) is given by:

Assuming f(r) drops to zero more quickly than 1/r, the inverse Abel transform is given by
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