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Changes of Variables Preserving Fourier-Stieltjes Transforms on Simply Connected Nilpotent Lie Groups
Published online by Cambridge University Press: 20 November 2018
Extract
In [1] Beurling and Helson prove the following theorem.
THEOREM. Let φ: R → R be a continuous map such that
Then φ is affine. (Here denotes the space of Fourier-Stieltjes transforms on R.)
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- Copyright © Canadian Mathematical Society 1977