A simple proof of the theorem of P. J. Cohen. (English) Zbl 0126.31902


43A05 Measures on groups and semigroups, etc.
22B99 Locally compact abelian groups (LCA groups)
43A25 Fourier and Fourier-Stieltjes transforms on locally compact and other abelian groups
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[1] Paul J. Cohen, On a conjecture of Littlewood and idempotent measures, Amer. J. Math. 82 (1960), 191 – 212. · Zbl 0099.25504
[2] Henry Helson, Note on harmonic functions, Proc. Amer. Math. Soc. 4 (1953), 686 – 691. · Zbl 0052.30203
[3] Henry Helson, On a theorem of Szegö, Proc. Amer. Math. Soc. 6 (1955), 235 – 242. · Zbl 0064.06804
[4] Walter Rudin, Idempotent measures on Abelian groups, Pacific J. Math. 9 (1959), 195 – 209. · Zbl 0085.10102
[5] Walter Rudin, Fourier analysis on groups, Interscience Tracts in Pure and Applied Mathematics, No. 12, Interscience Publishers (a division of John Wiley and Sons), New York-London, 1962. · Zbl 0105.09504
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