• Helson Beurling Teoremi ve Uygulamaları 

      Taş, Gizem (Fen Bilimleri Enstitüsü, 2018)
      In thesis we treat the celebrated Helson-Beurling Theorem which charac- terizes the closed subspaces of L2 which are invariant under the shift operator. We also treat the characterization of invariant subspaces of the ...