Self-Adjoint and Positive Approximants

Philip J. Maher

Chapter Chapter 3 in Operator Approximant Problems Arising from Quantum Theory, 2017, pp 15-25 from Springer

Abstract: 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.

Keywords: Approximate Po Sitions; Halmos; Positive Operator Approximation; Spectral Approximants; Unitarily Invariant Norm (search for similar items in EconPapers)
Date: 2017
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DOI: 10.1007/978-3-319-61170-9_3

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