科研之友
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摘要
We generalize the characterizations of the direct sum decomposition of a Hilbert space in terms of the angle R and, using this result, present another proof of the equality concerning the norms of the projections P and I - P. As an application to abstract frame theory, we show that the ranges of the analysis operators of oblique dual frame sequences satisfy the the angle condition.
- 出版日期2015-7
