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Hilbert C*—模中g—Riesz基的新刻畫

2018-05-08 11:11相中啟
關鍵詞:算子對偶小波

摘 要 利用算子理論方法證明了Hilbert C*-模上的可伴算子序列是g-Riesz基且有唯一對偶g-框架當且僅當相應的合成算子是一線性同胚,這修正了已有的一個結論.進一步,作為該結果的直接應用,給出了Hilbert C*-模中的g-Riesz基具有唯一對偶g-框架的保界等價刻畫.

關鍵詞 Hilbert C*-模;g-框架;g-Riesz基;對偶g-框架

中圖分類號 O177.1文獻標識碼 A文章編號 1000-2537(2017)06-0080-07

Abstract The present paper proves, by utilizing the method of operator theory, that a sequence of adjointable operators on a Hilbert C*-module is a g-Riesz basis with unique dual g-frame if and only if the corresponding synthesis operator is a homeomorphism, which provides a correction to one existing conclusion and further, as a direct application of this result, it gives an equivalent characterization for g-Riesz bases with unique dual g-frames in Hilbert C*-modules, which preserves the g-frame bounds.

Key words Hilbert C*-module; g-frame; g-Riesz basis; dual g-frame

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