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Gustafson, K. (1968) The Angle of an Operator and positive Operator Products. Bulletin of the American Mathematical Society, 74, 499-492.
https://doi.org/10.1090/S0002-9904-1968-11974-3

has been cited by the following article:

• TITLE: Extending Kantorovich-Type Inequalities to Normal Operators

  AUTHORS: Morteza Seddighin

  KEYWORDS: Kantorovich-Type Inequalities

  JOURNAL NAME: Advances in Linear Algebra & Matrix Theory, Vol.8 No.1, March 12, 2018

  ABSTRACT: We will extend some of the Kantorovich-Type inequalities for positive finite dimensional matrices to infinite dimensional normal operators by applying The Two-Nonzero Component Lemma and converting them to an An-tieigenvalue-Type problem.