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
Positivity – Springer Journals
Published: Jan 1, 2007
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