Operator Theory and Analysis

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On November 12-14, 1997, a workshop was held at the Vrije Universiteit Amsterdam to celebrate M. A. Kaashoek's sixtieth birthday. This volume contains the proceedings from the event, which welcomed 44 participants from various countries, including Austria, Belgium, Canada, Germany, Ireland, Israel, Italy, the Netherlands, South Africa, Switzerland, Ukraine, and the USA. The atmosphere was warm and friendly, featuring 21 plenary lectures followed by engaging discussions. The workshop received support from several institutions, including the Vakgroep Wiskunde and the department of Mathematics and Computer Science at the Vrije Universiteit, the Stichting VU Computer Science & Mathematics Research Centre, the Thomas Stieltjes Institute for Mathematics, and the department of Economics at Erasmus University Rotterdam. The organizers express their gratitude for this support, which contributed to the workshop's success. The volume includes a preface, a photograph of M. A. Kaashoek, his curriculum vitae, a list of publications, an opening address, personal reminiscences, and a detailed paper on the separation of certain spectral components of self-adjoint operator matrices, complete with an introduction, conditions for separation, an example, and references.