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Published in:
2017 | OriginalPaper | Chapter
3. Self-Adjoint and Positive Approximants
Author : Philip J. Maher
Published in: Operator Approximant Problems Arising from Quantum Theory
Publisher: Springer International Publishing
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Abstract
The subject of operator approximation dates back to the 1950s to the seminal work of Fan and Hoffman [16] who studied, in part, self–adjoint approximation. It was not, however, until the 1970s that the subject seems to have taken of, precipitated by the papers of Halmos [21, 22]. In [21] Halmos coined the term “approximant” and focused mainly on positive approximation.