Geodesic

Collection of articles on linear methods of summation of Fourier series

Linear methods of approximating certain classes of continuous periodic functions
p. 3-47
The approximation of periodic functions by Fej\'er sums
p. 48-60
Norms of trigonometrical polynomials and approximation of differentiable functions by averages of their Fourier series.~I
p. 61-97