Widths of certain classes of periodic functions in L2L2

In this paper, we obtain the exact values of nn-widths of some classes of periodic differentiable functions in the space L2[0,2π]L2[0,2π], satisfying the condition (∫0hωmp(f(r);t)sinγβhtdt)1/p≤1, where m,n,r∈N,1/r