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UID:7321@i2m.univ-amu.fr
DTSTART;TZID=Europe/Paris:20180424T110000
DTEND;TZID=Europe/Paris:20180424T120000
DTSTAMP:20241120T203911Z
URL:https://www.i2m.univ-amu.fr/evenements/a-problem-of-chowla-and-approxi
 mations-by-signed-harmonic-sums/
SUMMARY:Sandro Bettin (University of Genova): A problem of Chowla and appro
 ximations by signed harmonic sums
DESCRIPTION:Sandro Bettin: We discuss the non-vanishing of Dirichlet series
  of the form $\\sum_n f(n)d_k(n)/n^s$ at the point s=1\, where f is a peri
 odic function modulo q.\nWe then give a few results concerning the quality
  of the approximation of a real number \\tau by sums of the form \\sum_{n\
 \leq N} c_n /n with c_n\\in\\{\\pm1\\}\, as N goes to infinity.
ATTACH;FMTTYPE=image/jpeg:https://www.i2m.univ-amu.fr/wp-content/uploads/2
 020/01/Sandro_Bettin.jpg
CATEGORIES:Séminaire,Ernest
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DTSTART:20180325T030000
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