# Can we simply truncate a Fourier series if it is divergent?

by zetafunction
Tags: divergent, fourier, series, simply, truncate
 P: 399 given a Fourier series of the form $$\sum_{n=0}^{\infty}\frac{cos(nx)}{\sqrt{n}}$$ can i simply truncate this series up to some number finite N so i can get finite results ?? thanks.