A remark on a theorem of Beurling and Helson
A remark on a theorem of Beurling and Helson
The following result is due to Beurling and Helson [1, 2]: let , be a finite regular Borel measure on a locally compact abelian group G, and let u = Ean,uf7+v be its Lebesgue decomposition into discrete and continuous parts,' where /, is the mass 1 at g. Then if …