Differentiability of Riemann's function
Differentiability of Riemann's function
1. Introduction.In this paper we discuss on the differenti- ability of the function f(x)= , sin nx/n .Riemann proposed the problem that the function is nowhere differenti- able, [2] and [8].About the problem, J. P. Kahane [3] has investigated lacunary series.It was solved by J. Gerver [4] [5].First G. H. …