TY - BOOK AU - Maher,Philip J. ED - SpringerLink (Online service) TI - Operator Approximant Problems Arising from Quantum Theory SN - 9783319611709 AV - QA329-329.9 U1 - 515.724 23 PY - 2017/// CY - Cham PB - Springer International Publishing, Imprint: Birkhäuser KW - Operator theory KW - Functional analysis KW - Approximation theory KW - Quantum physics KW - Operator Theory KW - Functional Analysis KW - Approximations and Expansions KW - Quantum Physics N1 - What this book is about: approximants -- Preliminaries -- Self-adjoint and positive approximants -- Commutator approximants -- Spectral, and numerical range, approximants -- Unitary, isometric and partially isometric approximation of positive operators; Available to subscribing member institutions only. Доступно лише організаціям членам підписки N2 - This book offers an account of a number of aspects of operator theory, mainly developed since the 1980s, whose problems have their roots in quantum theory. The research presented is in non-commutative operator approximation theory or, to use Halmos' terminology, in operator approximants. Focusing on the concept of approximants, this self-contained book is suitable for graduate courses UR - https://doi.org/10.1007/978-3-319-61170-9 ER -