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arXiv 2006.08182math.FA
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关于齐次分解空间的一个离散变换

On a discrete transform of homogeneous decomposition spaces

Zeineb Al-Jawahri, Morten Nielsen

摘要:

在(各向异性)离散齐性Triebel-Lizorkin型空间和齐性调制空间中引入了几乎对角矩阵,并证明了这类几乎对角矩阵在矩阵乘法下是闭的.然后,我们将结果连接到连续设置,并表明一对时频帧的“帧变化”矩阵,具有适当的衰减特性,几乎是对角的。作为这一结果的应用,我们考虑了Triebel-Lizorkin型齐次分解空间和相应的调制空间的紧支撑框架展开的构造.

英文摘要:

We introduce almost diagonal matrices in the setting of (anisotropic) discrete homogeneous Triebel-Lizorkin type spaces and homogeneous modulation spaces, and it is shown that the class of almost diagonal matrices is closed under matrix multiplication. We then connect the results to the continuous setting and show that the "change of frame" matrix for a pair of time-frequency frames, with suitable decay properties, is almost diagonal. As an application of this result, we consider a construction of compactly supported frame expansions for homogeneous decomposition spaces of Triebel-Lizorkin type and for the associated modulation spaces.

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