On<em class="a-plus-plus">n</em>-widths of bounded periodic holomorphic functions

Abstract

The even-dimensional Kolmogorov widthsd _2n , Gel'fand widthsd ²ⁿ , and linear widths δ_2n ofà inL _q andC are determined exactly. We show that all threen-widths are equal and give a characterization of the widths in terms of Blaschke products.