A New Characterization of the Closedness of the Sum of Two Subspaces |
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| Authors: | Deng Chunyuan Du Hongke |
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| Affiliation: | aSchool of Mathematics Science, South China Normal University, Guangzhou 510631, China;bCollege of Mathematics and Information Science, Shaanxi Normal University, Xi'an 710062, China |
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| Abstract: | In this article, a new characterization of the closedness of the sum of two closed subspaces of a Hilbert space is established. |
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| Keywords: | Subspace projection sum of two closed subspaces |
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