Approximation in the mean and quasianalyticity

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12 Scopus citations


Let E be a compact subset of the complex plane with positive dx dy measure. For each p, 1 ≤ p < ∞, let Rp(E dx dy) denote the closure in Lp(E, dx dy) of the rational functions having no poles on E. We give an example where E has empty interior and the functions in Rp(E, dx dy), p ≥ 2, are uniquely determined by their values on any set of positive dx dy measure in E. Earlier, Sinanjan (Sibirsk Mat. Ž. 6 (1965), 1365-1381) obtained a somewhat weaker result along these lines and he also proved that this phenomenon can never occur when 1 ≤ p < 2.

Original languageEnglish
Pages (from-to)307-320
Number of pages14
JournalJournal of Functional Analysis
Issue number3
StatePublished - Mar 1973

ASJC Scopus subject areas

  • Analysis


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