Divergent series and generalized mixed problem for wave equation

Allowing the inversion of the operations of summation and integration for trigonometric Fourier series we present the solution by Fourier method of the generalized mixed problem for the homogeneous wave equation with zero initial velocity and fixed ends boundary conditions. The solution has the form of a series converging at an exponential rate. This series converges the classical solution if the latter equists. The results of the article reinforce the previously obtained results.