A Glimpse at Hilbert Space Operators: Paul R. Halmos in Memoriam

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Sheldon Axler, Peter Rosenthal, Donald Sarason
Springer Science & Business Media, Apr 13, 2011 - Mathematics - 362 pages
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Paul Richard Halmos, who lived a life of unbounded devotion to mathematics and to the mathematical community, died at the age of 90 on October 2, 2006. This volume is a memorial to Paul by operator theorists he inspired. Paul’sinitial research,beginning with his 1938Ph.D. thesis at the University of Illinois under Joseph Doob, was in probability, ergodic theory, and measure theory. A shift occurred in the 1950s when Paul’s interest in foundations led him to invent a subject he termed algebraic logic, resulting in a succession of papers on that subject appearing between 1954 and 1961, and the book Algebraic Logic, published in 1962. Paul’s ?rst two papers in pure operator theory appeared in 1950. After 1960 Paul’s research focused on Hilbert space operators, a subject he viewed as enc- passing ?nite-dimensional linear algebra. Beyond his research, Paul contributed to mathematics and to its community in manifold ways: as a renowned expositor, as an innovative teacher, as a tireless editor, and through unstinting service to the American Mathematical Society and to the Mathematical Association of America. Much of Paul’s in?uence ?owed at a personal level. Paul had a genuine, uncalculating interest in people; he developed an enormous number of friendships over the years, both with mathematicians and with nonmathematicians. Many of his mathematical friends, including the editors ofthisvolume,whileabsorbingabundantquantitiesofmathematicsatPaul’sknee, learned from his advice and his example what it means to be a mathematician.
 

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Contents

Paul Halmos Expositor Par Excellence
3
In His Own Words
11
Paul Halmos 19162006
27
Mathematical Review of How to Write Mathematics
30
Publications of Paul R Halmos
33
Photos
41
Part II Articles
78
What Can Hilbert Spaces Tell Us About Bounded Functions in the Bidisk?
81
Polynomially Hyponormal Operators
195
Essentially Normal Operators
209
The Operator FejerRiesz Theorem
223
A Halmos Doctrine and Shifts on Hilbert Space
255
The Behavior of Functions of Operators Under Perturbations
286
The Halmos Similarity Problem
325
Paul Halmos and Invariant Subspaces
341
Commutant Lifting
350

Dilation Theory Yesterday and Today
98
Toeplitz Operators
125
Dual Algebras and Invariant Subspaces
134
The State of Subnormal Operators
177
Double Cones are Intervals
359
Advances and Applications OT
363
Advances and Applications OT
364
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