A Positive Answer on Nirenberg’s Problem on Expansive Mappings in Hilbert Spaces
Nirenberg proposed a problem as to whether or not a continuous and expansive operator T:X⟶X (where X is a Hilbert space) is surjective if RT∘≠∅. I shall give a positive answer for the problem provided that RT∘ is unbounded. For contents related to this paper, the reader is referred to the remarks an...
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| Format: | Article |
| Language: | English |
| Published: |
Wiley
2022-01-01
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| Series: | Abstract and Applied Analysis |
| Online Access: | http://dx.doi.org/10.1155/2022/9487405 |
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