# Introduction to Fourier Series; Basic Formulas for Period 2(pi)

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Lesson Summary:

In this lesson, we learn about Fourier series and why they are important in solving differential equations. The Fourier series allows any reasonable f(t) which is periodic with period 2(pi) to be represented as an infinite sum of sines and cosines. By using the superposition principle, the response to any periodic function of period 2(pi) can be calculated. We also learn about the orthogonality relations between sine and cosine functions, which are the basis for calculating the coefficients in the Fourier series.

Lesson Description:

Introduction to Fourier Series; Basic Formulas for Period 2(pi) -- Lecture 15. Learn about one of the foremost topics in differential equations -- Fourier Series. Learn what they are and why they are important.

Arthur Mattuck, 18.03 Differential Equations, Spring 2006. (Massachusetts Institute of Technology: MIT OpenCourseWare), http://ocw.mit.edu (Accessed November 26, 2008). License: Creative Commons BY-NC-SA.