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In geometry, a Markushevich basis (sometimes Markushevich bases〔 or M-basis) is a biorthogonal system that is both ''complete'' and ''total''. It can be described by the formulation: : Let be Banach space. A biorthogonal system in is a Markusevich basis if :: : and :: separates the points in . Every Schauder basis of a Banach space is also a Markuschevich basis; the reverse is not true in general. An example of a Markushevich basis that is not a Schauder basis can be the set : of complex continuous functions in () whose values at 0 and 1 are equal, with the sup norm. It is an open problem whether or not every separable Banach space admits a Markushevich basis with for all . == References == 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「Markushevich basis」の詳細全文を読む スポンサード リンク
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