函数的幂级数展开及其应用

The Power Series Expansion of Functions and Its Application

摘要: 函数的幂级数展开是高等数学课程中的重要内容之一，作为一个强有力的数学工具，在分析学中占有举足轻重的地位，它允许我们将复杂的函数表示为简单多项式的无限和。幂级数展开在数学、物理学、工程学等领域有广泛的应用，如求解微分方程、近似复杂函数、信号处理等。本文主要探究函数的幂级数展开在组合数学中的应用，利用其得到一些特殊的数列，包括斐波那契数列和卡特兰数。

Abstract: The power series expansion of functions is one of the important contents in the course of advanced mathematics. As a powerful mathematical tool, it plays an important role in analysis. It allows us to express complicated functions as infinite sums of simple polynomials. The power series expansion is widely used in mathematics, physics, engineering and other fields, such as solving differential equations, approximating complicated functions, signal processing, etc. In this article, we mainly explore the application of power series expansion of functions in combinatorics, and use it to obtain some special sequences, including Fibonacci sequence and Catalan number.