Abstract
Certain characterizations of the Friedrichs and the Kre\(\breve{\imath }\)n von-Neumann extensions of the tensor product of two nonnegative linear relations A and B in terms of the Friedrichs and the Kre\(\breve{\imath }\)n-von Neumann extensions of A and B are provided. A characterization of the extremal extensions of the tensor product of A and B is also given.
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Roman, M., Sandovici, A. A Factorization Approach to the Extension Theory of the Tensor Product of Nonnegative Linear Relations. Results Math 72, 875–891 (2017). https://doi.org/10.1007/s00025-017-0719-z
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DOI: https://doi.org/10.1007/s00025-017-0719-z