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Introduction

Introduction Helmut H. Schaefer (1925–2005) Positivity 12 (2008), 1 c 2008 Birkh¨ auser Verlag Basel/Switzerland 1385-1292/010001-1 Positivity DOI 10.1007/s11117-007-9001-z HELMUT H. SCHAEFER (1925 – 2005) was one of the leading figures in creating a systematic theory of positivity within the burgeoning field of functional analysis. He leaves behind a mathematical opus of impeccable beauty and great depth in which, among other things, he transferred the classical Perron-Frobenius theory of positive matrices into modern infinite-dimensional analysis. Although he started his career in non-linear analysis with investigations cul- minating in the fixed point theorem which now carries his name, he soon got attracted by the work of Bourbaki with its focus on structures and symmetry and turned his attention to abstract (linear) functional analysis. In addition to numer- ous articles in leading journals, his two major monographs “Topological Vector Spaces” and “Banach Lattices and Positive Operators” bear witness to his mas- tery and have become classics. Helmut Schaefer had a unique ability to combine the organized, concise, and rigorous style a la Bourbaki with linguistic finesse and a healthy amount of prag- matism. He was a charismatic personality who inspired many students. The present issue of POSITIVITY is dedicated with gratitude and http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Positivity Springer Journals

Introduction

Arendt, Wolfgang; Nagel, Rainer; Wolff, Manfred
Positivity , Volume 12 (1) – Jan 1, 2007
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Publisher
Springer Journals
Copyright
Copyright © 2008 by Birkhäuser Verlag Basel/Switzerland
Subject
Mathematics; Fourier Analysis; Operator Theory; Potential Theory; Calculus of Variations and Optimal Control; Optimization; Econometrics
ISSN
1385-1292
eISSN
1572-9281
DOI
10.1007/s11117-007-9001-z
Publisher site
See Article on Publisher Site

Abstract

Helmut H. Schaefer (1925–2005) Positivity 12 (2008), 1 c 2008 Birkh¨ auser Verlag Basel/Switzerland 1385-1292/010001-1 Positivity DOI 10.1007/s11117-007-9001-z HELMUT H. SCHAEFER (1925 – 2005) was one of the leading figures in creating a systematic theory of positivity within the burgeoning field of functional analysis. He leaves behind a mathematical opus of impeccable beauty and great depth in which, among other things, he transferred the classical Perron-Frobenius theory of positive matrices into modern infinite-dimensional analysis. Although he started his career in non-linear analysis with investigations cul- minating in the fixed point theorem which now carries his name, he soon got attracted by the work of Bourbaki with its focus on structures and symmetry and turned his attention to abstract (linear) functional analysis. In addition to numer- ous articles in leading journals, his two major monographs “Topological Vector Spaces” and “Banach Lattices and Positive Operators” bear witness to his mas- tery and have become classics. Helmut Schaefer had a unique ability to combine the organized, concise, and rigorous style a la Bourbaki with linguistic finesse and a healthy amount of prag- matism. He was a charismatic personality who inspired many students. The present issue of POSITIVITY is dedicated with gratitude and

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Positivity – Springer Journals

Published: Jan 1, 2007

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