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Henry Helson : ウィキペディア英語版 | Henry Helson
Henry Berge Helson (June 2, 1927 – January 10, 2010) was an American mathematician at the University of California at Berkeley who worked on analysis. ==Helson sets== If G is an infinite, nondiscrete, locally compact group, then a Helson set is defined to be a compact set P in G such that every continuous function on P can be extended to a function in the Fourier algebra A(G) in the group G. Helson was the first to prove that there exist perfect Helson sets for the case of the group consisting of the real line.
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