8 Fourier Series and Transforms
Leslie Copley · 2014
De nition: A function f (x) is said to be periodic if it is de ned for all real x and if there is some real number T such that f (x + T) = f (x).The number T is then called the period of f (x).Examples: The sine and cosine functions have period π and along with constants, which have arbitrary period, are the simplest periodic functions.If it converges, a trigonometrical series of the form a +