Bela Szokefalvi-Nagy
Encyclopedia
Béla Szőkefalvi-Nagy was a Hungarian mathematician
. His father, Gyula Szőkefalvi-Nagy was also a famed mathematician. Szőkefalvi-Nagy collaborated with Alfréd Haar
and Frigyes Riesz
, founders of the Szegedian school of mathematics. He contributed to the theory of Fourier series
and approximation theory
. His most important achievements were made in functional analysis
, especially, in the theory of Hilbert space operators
. He was editor-in-chief of the Zentralblatt für Mathematik, the Acta Scientiarum Mathematicarum
, and the Analysis Mathematica. He was awarded the Lomonosov Medal in 1979: the Béla Szőkefalvi-Nagy Medal honoring his memory is awarded yearly by Bolyai Institute.
Mathematician
A mathematician is a person whose primary area of study is the field of mathematics. Mathematicians are concerned with quantity, structure, space, and change....
. His father, Gyula Szőkefalvi-Nagy was also a famed mathematician. Szőkefalvi-Nagy collaborated with Alfréd Haar
Alfréd Haar
Alfréd Haar was a Jewish Hungarian mathematician. In 1904 he began to study at the University of Göttingen. His doctorate was supervised by David Hilbert. The Haar measure, Haar wavelet, and Haar transform are named in his honor....
and Frigyes Riesz
Frigyes Riesz
Frigyes Riesz was a mathematician who was born in Győr, Hungary and died in Budapest, Hungary. He was rector and professor at University of Szeged...
, founders of the Szegedian school of mathematics. He contributed to the theory of Fourier series
Fourier series
In mathematics, a Fourier series decomposes periodic functions or periodic signals into the sum of a set of simple oscillating functions, namely sines and cosines...
and approximation theory
Approximation theory
In mathematics, approximation theory is concerned with how functions can best be approximated with simpler functions, and with quantitatively characterizing the errors introduced thereby...
. His most important achievements were made in functional analysis
Functional analysis
Functional analysis is a branch of mathematical analysis, the core of which is formed by the study of vector spaces endowed with some kind of limit-related structure and the linear operators acting upon these spaces and respecting these structures in a suitable sense...
, especially, in the theory of Hilbert space operators
Hilbert space
The mathematical concept of a Hilbert space, named after David Hilbert, generalizes the notion of Euclidean space. It extends the methods of vector algebra and calculus from the two-dimensional Euclidean plane and three-dimensional space to spaces with any finite or infinite number of dimensions...
. He was editor-in-chief of the Zentralblatt für Mathematik, the Acta Scientiarum Mathematicarum
Acta Scientiarum Mathematicarum
Acta Scientiarum Mathematicarum is a Hungarian mathematical journal, edited and published in Szeged, at the János Bolyai Mathematical Institute of the University of Szeged. It was founded by Alfréd Haar and Frigyes Riesz in 1922. The current editor-in-chief is László Kérchy....
, and the Analysis Mathematica. He was awarded the Lomonosov Medal in 1979: the Béla Szőkefalvi-Nagy Medal honoring his memory is awarded yearly by Bolyai Institute.
His books
- Béla Szőkefalvi-Nagy: Spektraldarstellung linearer Transformationen des Hilbertschen Raumes.(German) Berlin, 1942. 80 p.; 1967. 82 p.
- Frederic Riesz, Béla Szőkefalvi-Nagy: Leçons d'analyse fonctionnelle. (French) 2ème éd. Akadémiai Kiado, Budapest, 1953, VIII+455 pp.
- Ciprian FoiaşCiprian FoiasCiprian Ilie Foias is a Romanian-American mathematician. He was awarded the Norbert Wiener Prize in Applied Mathematics in 1995, for his contributions in operator theory....
, Béla Szőkefalvi-Nagy: Analyse harmonique des opérateurs de l'espace de Hilbert. (French) Masson et Cie, Paris; Akadémiai Kiadó, Budapest 1967 xi+373 pp. - Béla Szőkefalvi-Nagy, Frederic Riesz: Funkcionálanalízis. Budapest, 1988. 534 p. (English: Functional Analysis (1990). Dover. ISBN 0-486-66289-6)
His articles
- Diagonalization of matrices over H∞. Acta Scientiarum Mathematicarum. Szeged, 1976
- On contractions similar to isometries and Toeplitz operators, with Ciprian Foiaş. Ann. Acad. Scient. Fennicae, 1976.
- The function model of a contraction and the space L’/H’, with Ciprian Foiaş. Acta Scientiarum Mathematicarum. Szeged, 1979, 1980.
- Toeplitz type operators and hyponormality, with Ciprian Foiaş. Operator theory. Advances and appl., 1983.
- Factoring compact operator-valued functions, with authors. Acta Scientiarum Mathematicarum. Szeged, 1985.
To the memory of Béla Szőkefalvi-Nagy
- Operator theory: advances and applications. Recent advances in operator theory and related topics : the Béla Szökefalvi-Nagy memorial volume : [memorial conference held August 2–6, 1999 in Szeged] / eds. László Kérchy et al. BaselBaselBasel or Basle In the national languages of Switzerland the city is also known as Bâle , Basilea and Basilea is Switzerland's third most populous city with about 166,000 inhabitants. Located where the Swiss, French and German borders meet, Basel also has suburbs in France and Germany...
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; BerlinBerlinBerlin is the capital city of Germany and is one of the 16 states of Germany. With a population of 3.45 million people, Berlin is Germany's largest city. It is the second most populous city proper and the seventh most populous urban area in the European Union...
: Birkhäuser VerlagBirkhäuser VerlagBirkhäuser Verlag is the leading European publisher for architecture, landscaping and design. Since 2010 it is part of the ActarBirkhäuser Group.-Scientific publishing:Founded in 1879 by Emil Birkhäuser the publishers program focused on regional literature...
, 2001. XLIX, 670 p. (Operator theory : advances and applications ; 127.) ISBN 3-7643-6607-9