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In mathematical analysis, Krein's condition provides a necessary and sufficient condition for exponential sums : to be dense in a weighted L2 space on the real line. It was discovered by Mark Krein in the 1940s. A corollary, also called Krein's condition, provides a sufficient condition for the indeterminacy of the moment problem. ==Statement== Let ''μ'' be an absolutely continuous measure on the real line, d''μ''(''x'') = ''f''(''x'') d''x''. The exponential sums : are dense in ''L''2(''μ'') if and only if : 抄文引用元・出典: フリー百科事典『 ウィキペディア(Wikipedia)』 ■ウィキペディアで「Krein's condition」の詳細全文を読む スポンサード リンク
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