Mathematics – Classical Analysis and ODEs
Scientific paper
2010-03-24
Mathematics
Classical Analysis and ODEs
Une introduction en anglais explique pourquoi cet article ne sera pas inclus dans le volume d'hommage \`a Peyri\`ere auquel il
Scientific paper
Jacques Peyri\`ere investigated Riesz products associated with a given set of frequencies and the corresponding coefficients : mutual singularity or absolute continuity of the measures defined by two such products, Hausdorff dimensions of the sets carrying such measures, multifractal analysis. The present expository paper starts from Peyri\`ere's results and give some new ways to investigate the same questions. Since Riesz products are also an essential tool for Sidon sets, the characterisations of Sidon sets by Pisier and Bourgain, using quasi-independent sets, are given and commented. The paper ends with an elementary construction of a <> quasi-independent set. The paper is in French. An introduction, in English, explains why it will not be published in the book to which it was intended to contribute.
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