Two examples of subspaces in L2lspanned by characters of finite order
Mats Erik Andersson · Colloquium Mathematicum · 2001
By a Fourier multiplier technique on Cantor-like Abelian groups with characters of finite order, the norms from $L^2$ into $L^{2l}$ of certain embeddings of character sums are computed. It turns out that the orders of the characters are immaterial as soon